摘要：
fleetstreet英语历史文化一、属于文化遗产有21处： 1、明清皇宫（北京故宫、沈阳故宫） 1987年被联合国教科文组织授予世界历史文化遗产。2、颐和园（北京） 19... fleetstreet英语历史文化
一、属于文化遗产有21处： 1、明清皇宫（北京故宫、沈阳故宫） 1987年被联合国教科文组织授予世界历史文化遗产。
2、颐和园（北京） 1998年被联合国教科文组织授予世界历史文化遗产。 3、长城（北京） 1987年被联合国教科文组织授予世界历史文化遗产。
4、天坛（北京） 1998年被联合国教科文组织授予世界历史文化遗产。 5、承德避暑山庄（河北承德，包括周围寺庙） 1994年被联合国教科文组织授予世界历史文化遗产。
6、平遥古城（山西平遥） 1997年被联合国教科文组织授予世界历史文化遗产。 7、周口店北京人遗址（北京周口店） 1987年被联合国教科文组织授予世界历史文化遗产。
8、丽江古城（云南丽江） 1997年被联合国教科文组织授予世界历史文化遗产。 9、苏州古典园林（江苏苏州） 1997年被联合国教科文组织授予世界历史文化遗产。
10、秦始皇陵及兵马俑坑（陕西西安） 1987年被联合国教科文组织授予世界历史文化遗产。 11、大足石刻（重庆大足县） 1999年被联合国教科文组织授予世界历史文化遗产。
12、武当山古建筑（湖北丹江市） 1994年被联合国教科文组织授予世界历史文化遗产。 13、莫高窟 （甘肃敦煌市沙鸣山） 1987年被联合国教科文组织授予世界历史文化遗产。
14、布达拉宫（ *** *** ） 1994年被联合国教科文组织授予世界历史文化遗产。 15、龙门石窟 （河南省洛阳市） 2000年11月被联合国教科文组织授予世界历史文化遗产。
16、孔庙、孔林、孔府（山东曲阜） 1994年被联合国教科文组织授予世界历史文化遗产。 17、明清皇家陵寝 （明显陵、清东陵、清西陵、明孝陵、十三陵、盛京三陵） 2000年被联合国教科文组织授予世界历史文化遗产。
18、青城山-都江堰（四川青城山） 2000年被联合国教科文组织授予世界历史文化遗产。 19、皖南古村落 （安徽西递村） 2000年11月30日被联合国教科文组织授予世界历史文化遗产。
20、云冈石窟（山西大同） 2001年被联合国教科文组织授予世界历史文化遗产。 21、中国高句丽王城、王陵及贵族墓葬（吉林集安市、辽宁桓仁县） 2004年7月1日被联合国教科文组织授予世界历史文化遗产。
二、世界自然遗产，共4处： 1、九寨沟 （四川南坪县） 1992年被联合国教科文组织授予世界历史文化遗产。 2、黄龙（四川松潘县） 1992年被联合国教科文组织授予世界历史文化遗产。
3、武陵源 （湖南武陵） 1992年被联合国教科文组织授予世界历史文化遗产。 4、三江并流 （云南） 2003年7月2日被联合国教科文组织授予世界历史文化遗产。
“三江并流”是指金沙江、澜沧江和怒江交汇而形成的壮观景象。 三、世界文化与自然遗产，共4处： 1、泰山（山东泰安） 1987年被联合国教科文组织授予世界历史文化遗产。
2、黄山（湖北省） 1992年被联合国教科文组织授予世界历史文化遗产。 3、峨眉山-乐山大佛 （四川峨眉山市） 1997年被联合国教科文组织授予世界历史文化遗产。
4、武夷山（福建） 1992年被联合国教科文组织授予世界历史文化遗产。 四、文化景观，共1处： 1、庐山（江西九江市） 1996年被联合国教科文组织授予世界历史文化遗产。
五、人类口述和非物质遗产代表作，共2处： 1、昆曲（江苏昆山） 2001年被联合国教科文组织授予世界历史文化遗产。 昆曲产生于元末明初江苏昆山一带，时间上至今已有600多年的历史了。
2、古琴 2003年11月7日被联合国教科文组织授予世界历史文化遗产。
It's alarming tosee that many heritage places have to give way to construction of localeconomy, which I personally think is short-sighted.
It's mon sensethat cultural relics are part of our history as well as our present life. In my personal opinion, todestroy cultural heritage means to ruin our culture and to betray our history. Therefore, things must be done tostop the irresponsible action.
• As far as I'm concerned, weshould first spare no effort to makepeople realize the importance and necessity of protecting cultural heritage,which seems a challenging task, though. Besides, the government should wisely set up funds for the preservation for cultural heritages.•To conclude, I strongly believe thatif everybody makes a *** all change, we'll make a great difference on theprotection of heritage places.
It'The Yellow Mountain is one of the most famous mountains in China . It lies in the south of Anhui . Every year thousands of and foreigners pay a visit there . You can also go there by train or by plane . While you are climbing the mountain , you can enjoy the sea of clouds , wondrous pines and unique rocks around you . In the early morning when the sun rises ;s not far from here . It takes you about three hours to get there by bus。
Too few people to pay attention to China's culture. Urban cultural heritage is the witness of the historical development of the city is the city an important basis for historical research. Sustainable development an important aspect is to protect the historical and cultural heritage. We can adopt the following methods of protection, the entire society to let people know the significance of cultural heritage protection, the enhancement of people's protection. And then some sites do not open to the public, to a fine of spoilers, the last teacher education allows students to awareness of the importance of the protection of cultural sites.
太少的人去关注中国的文化了。城市文化遗产是城市历史发展的见证，是城市历史研究的重要依据。可持续发展的一个重要方面是保护历史文化遗产。我们可以通过以下方法保护，首先要让全社会人民都知道文化遗产保护的意义，提高人们的保护意识。然后有些遗址不对外开放，对破坏者进行罚款，最后可以让老师教育学生要意识保护文化遗址的重要性。
给分。。
Philadelphia is the largest city in the Commonwealth of Pennsylvania and the county seat of Philadelphia County,with which it is city is located in the Northeastern United States along the Delaware and Schuylkill is the fifth-most-populous city in the United States,[3] with a 2010 estimated population of 1,526,006.[4] Philadelphia is also the mercial,cultural,and educational center of the Delaware Valley,home to 6 million people and the country's fifth-largest metropolitan area.[5] The Philadelphia metropolitan division consists of five counties in Pennsylvania and has a population of 4,008, nicknames for Philadelphia are Philly and The City of Brotherly Love,the latter of which es from the literal meaning of the city's name in Greek,Modern Greek:"brotherly love",pounded from philos "loving",and adelphos "brother").[6] Philadelphia was founded on October 27,1682 by William Penn,who planned a city along the Delaware River to serve as a port and place for city grew rapidly,and by the 1750s Philadelphia was the largest city and busiest port in the original 13 American colonies.[7][8] During the American Revolution,Philadelphia played an instrumental role as a meeting place for the Founding Fathers of the United States,who signed the nation's Declaration of Independence on July 4,1776 and the Constitution on September 17, served as one of the nation's many capitals during the Revolutionary War,and the city served as the temporary national capital from 1790 to 1800 while Washington, under the 19th century,Philadelphia became a major industrial center and a railroad hub that grew from an influx of European city's dominant textile industry represented 40 percent of total United States output in 1906.[9] It became a major destination for African Americans during the Great Migration and surpassed 2 million occupants by 1950. Philadelphia has transitioned from being a manufacturing powerhouse to an information and service-based activities account for the largest sector of the metro economy,and it is one of the largest health education and research centers in the United 's history attracts many tourists,with the Liberty Bell receiving over 2 million visitors in 2010.[10] The Delaware Valley contains the headquarters of thirteen Fortune 500 corporations,five of which are in Philadelphia proper.[11] With a gross domestic product of $388 billion,Philadelphia ranks ninth among world cities and fourth in the nation.[12] The city is also the nation's fourth-largest consumer media market,as ranked by the Nielsen Media Research. Philadelphia is known for its arts and cheesesteak and soft pretzel are emblematic of Philadelphia cuisine,which is heavily influenced by the city's Italian-American city has more outdoor sculptures and murals than any other American city,[13] and Philadelphia's Fairmount Park is the largest landscaped urban park in the world.[14] Gentrification of Philadelphia's neighborhoods continues into the 21st century and the city has reversed its decades-long trend of population loss.
石家庄的历史文化英文
Sitting in the central south of vast North China Plain,Shijiazhuang City is located at the longitude of 114°29'E, and the latitude of 38°04' the Capital-Beijing and Port City–Tianjin in the North, and Bohai Sea and North China Oilfields in the east, and the towering Taihang Mountains and the coal bases in China–Shanxin Province in the west, Shijiazhuang City was called “the Nation Capital's Suburbs”in the old times. Shijiazhuang City enjoyes convenient transportation conditions, called as “a gate from south to north and the throat from Hebei to Shanxi”.Shijiazhuang has two landforms-Taihang Mountains and North China Plain. The west part belongs to the middle section of Taihang Mountains, including Jingxing county and Jingxing mining area, the mountainous area of Pingshan, Zanhuang, Xangtang, Lingtang and Luquan, 50% of Shijiazhuang's total territory. The east part is alluvia-proluvial plain, including Xinle, Wuji, Shenze, Xinji, Jinzhou, Gaocheng, Gaoyi, Zhao County, Luancheng, Zhengding, Shijiazhuang, and the plain area of Pingshan, Zanhuang, Xingtang, Lingshou, Luquan, Yuanshi shi. The gradient from the West - Pingshan to Shijiazhuang is 1/1400-1/1200, and 1/1200-1/1400 from Shijiazhuang to the East - Xinji. Its dominant area is just in the contiguous area of the mountains of Shanxi and the sunken area of Bohai so that it is low in the East and high in the West, and its landforms are complex. The sea level elevation of Taihang Mountains in the West is 1000 meters or so, and on the east of Jingguang Railway it belongs to Huabei Plain. The platforms are mountain, small mountain, hill, basin and plain from west to east. The highest point within Shijiazhuang is Tuoliang Mountain, which has a sea level elevation of 2281 meters, and it is the fifth highest mountain in Hebei province. The eastern plain is classified as alluvia-proluvial plain in front of Taihang Mountains according to its origin that has an average sea level elevation of about 30-100 meters, and of which the Beipang village of Xinji is the lowest point, only 28 meters. (the following data provided by Municipal Urban Planning Bureau) inside the second-order loop of Shjiazhuang it is low in the Southeast where the sea level elevation is meters, and high in the Northeast where the sea level elevation is in the temperature continental monsoon climate, it's clearly distinguished between seasons with yearly average temperature of centigrade, the coldest month of the year (January) at – centigrade, compared with the warmest (July) at centigrade. The average precipitation is 570mm, sunshine hours more than 2200 and frost-free period more than 240 are six main rivers in Shijiazhuang including Sha River and Ci River & Mudao Ditch in the north that are tributaries of Daqing River, and Hutuo River, Jiao River, Huai River and Ji River in the middle-south which are tributaries of Ziya River. The water area totaled ten thousand square rivers'upper reaches have many tributaries and little vegetation with the torrent surging ahead so that the floods go up and down suddenly. After each river enters the plain, the channels are becoming wide, shallow and curving, so the river channels often change before the founding of our People's Republic. But after the founding of our People's Republic, under the leading of our party and government we do the flood control works on the upper reaches of each river, and on the lower reaches we renovate and reinforce the dike up to 500 kilometers so that we can prevent and control the flood more RiverHutuo River is one of the two tributaries of Ziya River. Originated from the northern foot of Wutai Mountains in Fanzhi county of Shanxi province, it winds through Xinding basin and Taihang Mountains, and then enters Pingshan county of Shijiazhuang from Yanzhuang of Yu county. With the Ye River joining near Huangbizhuang of Luquan city, it traverses eastwardly the outskirts such as Zhengding, Gaocheng, Jinzhou, Wuji, and then leaves Shijiazhuang in Shenze county entering Anping county of Hengshui city. The Shijiazhuang section of Hutuo River runs 201 kilometers, which is the biggest floodway in Shijiazhuang. The flood control standard is once in 50 years with the discharge of 3300 cubic meters per second, and its main dike in the north is the important flood control works of Hebei province. On the upper reaches of Hutuo River the large-scale reservoirs such as Gangnan reservoir and Huangbizhuang reservoir are built on its trunk streams and the middle-scale reservoirs such as Shiban reservoir and Xiaguan reservoir are built respectively on the Wendu River and Nandian River which are the tributaries of Futuo RiverJiao River is originated from the northern mountain of Luquan city and runs to Luancheng county with Jin River and the flood-relief channel of Shijiazhuang joining, and then leaves Shijiazhuang through Zhao county and runs to Ningjin county of Xingtai city with Beisha River and Zhulong River joining. The Shijiazhuang section of Jiao River runs 48 kilometers, which is not only the main floodway of Shijiazhuang city but also one of the main flood control works. The flood control standard is once in 12 years with the discharge of 665 cubic meters per second, and the standard of draining flood is once in 3 years with the largest discharge of 178 cubic meters per second. Bayi reservoir is built on its tributary of Zhulong RiverHuai River is originated from Zhangshiyan in the southwest of Zanhuang county, and runs to Ningjin county of Xingtai city through Yuanshi, Gaoyi and Zhao county with the length of 79 kilometers and the discharge of 1258-2180 cubic meters per second. The middle-scale reservoir such as Baicaoping reservoir is built on its upper RiverNing River is originated from Dashimen in the southwest of Zanhuang county, and runs through the south of Zanhuang, the southwest of Gaoyi, and then leaves and enter Baixiang of Xingtai city. It is 61 kilometers long with the discharge of 460-780 cubic meters per second. And the middle-scale reservoir such as Nanpingwang reservoir is built on its upper RiverOriginated from Lingqiu county of Shanxi province, Sha River enters Shijiazhuang from Xingtang county, then runs across Xinle with Qu River, Huao River joining, and then goes to Dingzhou of Baoding city, which is one of the main southern branches of Daqing River. The large-scale Wangkuai reservoir is built on the branch in the domain of Quyang County. The large-scale reservoir such as Wangkuai reservoir and Koutou reservoir, and middle-scale reservoir such as Honglingjin reservoir are respectively built on Sha River, Hao River and Qu River & Mudao DitchCi River & Mudao Ditch is originated from Tuoliang in the northwest of Lingshou county and runs through Xinle, Wuji, Shenze, and then enters Anguo county of Baoding city joining Sha River. The upper stream above Nanful River is called Ci River, and the low stream Mudao Ditch. The flood control standard is once in 20 years with the discharge of 1260 cubic meters per second. The large-scale reservoir such as Hengshanling reservoir is built on its upper reaches.
求一篇关于石家庄的英语介绍Introduction to Shijiazhuang Hebei Province, 269km (168 miles) SW of Beijing Hebei's nondescript capital is one of the few places in China where the intention to rebuild everything from scratch in only 20 years is actually improving the city. Down-at-heel Shijiazhuang is an accident arising from the crossing of major north-south and east-west railway lines -- here X really does mark the spot. It's grown from village to provincial capital in 100 years. Even that status is a hand-me-down from Tianjin, after the metropolis gained the right to report directly to Beijing rather than through the provincial government. As a result there's little of glamour here. But the city has a decent infrastructure for visitors and provides a base for exploring marvelous sights in the surrounding countryside, includingZhengding, about 15km (10 miles) northeast. It was an important town for centuries before anyone had heard of Shijiazhuang. Today it is still home toLongxing Si, one of the oldest, most atmospheric, and (luckily) least "restored" Chinese temples. Zhengding is also home to a number of pagodas so different from each other it's hard to believe they were produced by the same Xian,42km (26 miles) southeast, has an important example of religious revival in the large Zen (Chan) Buddhist temple, theBailin also has the elegantZhaozhou Qiao-- the first bridge of its kind in the world. Roughly 80km (50 miles) southwest,Cangyan Shanhas the bridge-top temple featured in the closing scenes ofCrouching Tiger, Hidden Dragon.附:Shijiazhuang City is located in the eastern edge of the Eurasian continent latitude, a temperate continental monsoon climate. The seasonal changes in solar radiation significantly, the ground level of depression frequent activities, four distinct seasons, the disparity between the Han Shu, concentrated rainfall, significant period of wet and dry, winter-summer, spring and autumn short. About 55 days in spring, summer is about 105 days, about 60 days in the autumn, winter is about 145 days. Dry spring weather, less rainfall, often 5,6-northerly winds or southerly wind, temperatures rise faster in April; summer, Temperature and Humidity airstream affected by the ocean, 6,7,8 three months of the year precipitation precipitation 63 to 70 percent; fall, the influence of high pressure Mongolia, sunny weather, the temperature moderate and pleasant weather, late autumn and more northeasterly winds, cold weather in winter, the Siberian cold high impact, the prevailing northwest wind, cold and dry climate, Shaoyang weather, less rainfall. Shijiazhuang City, the general climate characteristics: average temperature in the high-temperature hot summer and cold in winter Chiu-Liang, uneven distribution of rainfall, most parts of nearly all year round, the western part of Abundant rainfall in the mountains, there floods, less sunshine, spring High winds, the weather Yangsha more. Total precipitation for the mm, the uneven distribution of time and space. One western mountain rainfall of mm; mm for the other regions. Abundant snow in winter, the snow was mm, of which the urban areas to mm of snow. Snow brought traffic to many people's inconvenience, vegetable prices rose, while a protective effect of winter wheat, for reviving the spring to provide a favorable water conditions. Less Rainfall in the spring, the quarter of the total rainfall of mm. Uneven distribution of rainfall in the summer, mm of rainfall. The total duration of bright sunshine hours for hours, adequate sunlight in spring and summer, autumn and winter sunshine less.石家庄市地处中纬度欧亚大陆东缘，属于暖温带大陆性季风气候。太阳辐射的季节性变化显著，地面的高低气压活动频繁，四季分明，寒暑悬殊，雨量集中，干湿期明显，夏冬季长，春秋季短。 春季长约55天，夏季长约105天，秋季长约60天，冬季长约145天。春季气候干燥，降水量少，常有5、6级偏北风或偏南风，4月份气温回升快；夏季，受海洋温湿气流影响，6、7、8三个月降水占全年降水量的63%-70%；秋季，受蒙古高压影响，晴朗少雨，温度适中，气候宜人，深秋多东北风，有寒潮天气发生；冬季，受西伯利亚冷高压的影响，盛行西北风，气候寒冷干燥，天气晴朗少云，降水少。 石家庄市总的气候特点为：年平均气温偏高，春温夏热秋凉冬冷，雨量分布不均，大部分地区接近常年，西部部分山区雨量偏多，出现洪涝灾害，日照偏少，春季大风、扬沙天气较多。 总降水量为毫米，时空分布不均。其中西部山区雨量为毫米；其它地区为毫米。冬季降雪量偏多，总雪量为毫米，其中，市区雪量为毫米。大雪给人们的交通带来许多不便，蔬菜价格上扬，同时对小麦越冬起到保护作用，为春季返青提供了有利的水分条件。春季降水偏少，季总雨量为毫米。夏季雨量分布不均，降雨量为毫米。 年总日照时数为小时，其中春夏日照充足，秋冬日照偏少。介绍石家庄的英语作文简单一点的带翻译Shijiazhuang is the capital and largest cityof North China's Hebei Province. Administratively a prefecture-level city, it is about 280 kilometres (170 mi) south of Beijing. Shijiazhuang Prefecture contains the Shijiazhuang metropolitan area, the Jingxing Mining District, five county-level cities, and twelve counties, and has a total population of million, with million in the metro area . 石家庄是河北省的首都和最大的城市华北地区，管理着一个地级市，这是约280公里（170英里）北京南部。石家庄地区包含石家庄大都会区、井陉矿区、五个县级市和十二个县，总人口960万人，260万人口在处于地铁领域石家庄英语作文石家庄英语作文Shi Jia Zhuang,lies on the south of He Bei province,has plenty of dangerous weather here is fine and we can see 4 seasons here it doesn't have enough plants,it has flood every a result,the government has to take action to protect Shi Jia Jia Zhuang is famous because of its rich of national attracts many foreigners to come here to go sightseeing and makes here develope very protects it as possible as it can and Shi Jia Zhuang becomes more and more famous.翻译：石家庄，位于河北省的南面，有很多险峰。石家庄气候很好，可以清晰地看到四季的变化。由于没有足够的植被，石家庄每年都要遭遇洪水。如此一来，政府不得不采取措施来保卫石家庄。石家庄因为其丰富的自然资源而闻名。石家庄每年吸引很多外国游客来旅游观光，这令其发展很快。现在，政府在竭尽所能地保护石家庄，石家庄也越来越出名。英语作文，高二水平，介绍石家庄，要有些景点，可以根据必修5的sightseeing in LondShijiazhuang is the capital and largest city of North China's Hebei Province. Administratively a prefecture-level city, it is about 280 kilometres (170 mi) south of Beijing. Shijiazhuang Prefecture contains the Shijiazhuang metropolitan area, the Jingxing Mining District, five county-level cities, and twelve counties, and has a total population of million, with million in the metro area in 2008. Shijiazhuang is a newly industrialised city. It experienced dramatic growth after the founding of the People's Republic of China in 1949. The population of the metropolitan area has more than quadrupled in only 30 years[1] It is a central hub of transportation routes. The city is home to large garrison of military troops in case of need to protect Beijing[1] It has a number of PLA colleges and universities. Electronics engineering, also referred to as electronic engineering, is an engineering discipline where non-linear and active electrical components such as electron tubes, and semiconductor devices, especially transistors, diodes and integrated circuits, are utilized to design electronic circuits, devices and systems, typically also including passive electrical components and based on printed circuit boards. The term denotes a broad engineering field that covers important subfields such as analog electronics, digital electronics, consumer electronics, embedded systems and power electronics. Electronics engineering deals with implementation of applications, principles and algorithms developed within many related fields, for example solid-state physics, radio engineering, telecommunications, control systems, signal processing, systems engineering, computer engineering, instrumentation engineering, electric power control, robotics, and many others我的故乡的英语作文介绍石家庄的写作思路：根据题目要求，围绕石家庄进行描写。Shijiazhuang is my hometown. It is a beautiful, rich and beautiful place.石家庄是我的家乡，是一个美丽富饶、风景秀丽的地方。There are rolling hills and terraces.那里有起伏、叠连的丘陵和层层的梯田。The dense woods and green grass give the area a colorful coat.茂密的树林和绿油油的草地，给岭区穿上了一件彩色的外衣。Shijiazhuang has parks and gardens in big cities, as well as hot springs in small cities.石家庄有大城市的公园、花园，还有小城市的温泉。Shijiazhuang not only has a long history, but also is rich in products.石家庄不仅仅历史悠久，并且物产丰富。The key is that it is an important transportation hub.关键是它是一个重要的交通枢纽。How beautiful my hometown is! I love my hometown!我的家乡多么美丽啊！我爱我的家乡！
只改一处，280 km to the south of Beijing
its very good,i really think so.
催化剂的发展历史英文
催化剂英文介绍如下：
catalyzer：
n.催化剂。
Application of water system integration technology with water mains in catalyzer factory .
中间水道水系统集成技术在催化剂厂的应用。
The method could provide important basis of the experimental data to the catalyzer improvement and mechanism.
该方法可为催化剂的改进与催化机理研究提供重要的基础实验数据。
The functions of their diffuseness, orientation, agglomeration, catalyzer and controls are indispensable factors of science development.
其传播功能、导向功能、凝聚功能、催化功能和控制功能等等是科学事业发展中必不可少的重要因素。
The Research of Computer Simulation for the Precious Supported Thin Film Catalyzer .
沉积贵金属载体薄膜催化剂的计算机模拟研究。
Two screw Extruder of A Forward Press Type Used in Forming Catalyzer .
用于催化剂成型的前挤式双螺杆挤条机。
英文名称：polyethylene 日文名称：ポリエチレン 。简称PE，是乙烯经聚合制得的一种热塑性树脂。在工业上，也包括乙烯与少量 α－烯烃的共聚物。聚乙烯无臭，无毒,手感似蜡,具有优良的耐低温性能(最低使用温度可达-70～-100℃),化学稳定性好,能耐大多数酸碱的侵蚀(不耐具有氧化性质的酸),常温下不溶于一般溶剂,吸水性小,电绝缘性能优良；但聚乙烯对于环境应力(化学与机械作用)是很敏感的，耐热老化性差。聚乙烯的性质因品种而异，主要取决于分子结构和密度。采用不同的生产方法可得不同密度(～／cm3）的产物。聚乙烯可用一般热塑性塑料的成型方法(见塑料加工)加工。用途十分广泛，主要用来制造薄膜、容器、管道、单丝、电线电缆、日用品等，并可作为电视、雷达等的高频绝缘材料。随着石油化工的发展，聚乙烯生产得到迅速发展，产量约占塑料总产量的1/4。1983年世界聚乙烯总生产能力为，在建装置能力为。 今年来在核物理,天体物理,反应堆运行中运用聚乙烯作为漫化剂来测量中子.对核物理的研究做出了自己的贡献.[编辑本段]结构式 CH2=CH2+CH2=CH2+······→—CH2—CH2—CH2—CH2······ 简写：nCH2=CH2→ 聚合压力大小：高压、中压、低压； 聚合实施方法： 淤浆法、溶液法 、气相法 ； 产品密度大小：高密度、中密度、低密度、线性低密度； 产品分子量：低分子量、普通分子量、超高分子量。[编辑本段]生产方法 分为高压法、低压法、中压法三种。高压法用来生产低密度聚乙烯，这种方法开发得早，用此法生产的聚乙烯至今约占聚乙烯总产量的2/3,但随着生产技术和催化剂的发展，其增长速度已大大落后于低压法。低压法就其实施方法来说，有淤浆法、溶液法和气相法。淤浆法主要用于生产高密度聚乙烯，而溶液法和气相法不仅可以生产高密度聚乙烯，还可通过加共聚单体，生产中、低密度聚乙烯，也称为线型低密度聚乙烯。近年来，各种低压法工艺发展很快。中压法仅菲利浦公司至今仍在采用，生产的主要是高密度聚乙烯。 聚乙烯特性 聚乙烯无臭，无毒，手感似蜡，具有优良的耐低温性能(最低使用温度可达-70～-100℃)，化学稳定性好，能耐大多数酸碱的侵蚀(不耐具有氧化性质的酸)，常温下不溶于一般溶剂，吸水性小，电绝缘性能优良；但聚乙烯对于环境应力(化学与机械作用)是很敏感的，耐热老化性差。 聚乙烯的性质因品种而异，主要取决于分子结构和密度。 聚乙烯的种类 （1） LDPE：低密度聚乙烯、高压聚乙烯 （2） LLDPE：线形低密度聚乙烯 （3） MDPE：中密度聚乙烯、双峰树脂 （4） HDPE：高密度聚乙烯、低压聚乙烯 （5） UHMWPE：超高分子量聚乙烯 （6）改性聚乙烯：CPE、交联聚乙烯（PEX） （7）乙烯共聚物：乙烯-丙烯共聚物（塑料）、EVA、乙烯-丁烯共聚物、乙烯-其它烯烃（如辛烯POE、环烯烃）的共聚物、乙烯-不饱和酯共聚物（EAA、 EMAA 、EEA、EMA、EMMA、EMAH） 分子量达到3，000，000-6，000，000的线性聚乙烯称为超高分子量聚乙烯(UHMWPE)。超高分子量聚乙烯的强度非常高，可以用来做防弹衣。 主要方法： 液相法（又分为溶液法和淤浆法）和气相法（物料在反应器中的相态类型）。我国主要采用齐格勒催化剂的淤浆法。 条件与过程描述：纯度99%以上的乙烯在催化剂四氯化钛和一氯二乙基铝存在下，在压力和温度65-75℃的汽油中聚合得到HDPE的淤浆。经醇解破坏残余的催化剂、中和、水洗，并回收汽油和未聚合的乙烯，经干燥、造粒得到产品。 化学名称：聚乙烯 英文名称:Polyethylene（简称PE） 比重:克/立方厘米 成型收缩率: 成型温度：140-220℃ 特点：耐腐蚀性,电绝缘性(尤其高频绝缘性)优良,可以氯化,化学交联、辐照交联改性,可用玻璃纤维增强.低压聚乙烯的熔点,刚性,硬度和强度较高,吸水性小,有良好的电性能和耐辐射性;高压聚乙烯的柔软性,伸长率,冲击强度和渗透性较好;超高分子量聚乙烯冲击强度高,耐疲劳,耐磨. 低压聚乙烯适于制作耐腐蚀零件和绝缘零件;高压聚乙烯适于制作薄膜等;超高分子量聚乙烯适于制作减震,耐磨及传动零件. 成型特性： 1.结晶料,吸湿小,不须充分干燥,流动性极好流动性对压力敏感,成型时宜用高压注射,料温均匀,填充速度快,保压充分.不宜用直接浇口,以防收缩不均,内应力增大.注意选择浇口位置,防止产生缩孔和变形. 2.收缩范围和收缩值大,方向
中国历史文化的英语作文
画龙点睛（Putting the Finishing Touch to the Picture of a Dragon） In the Southern and Northern Dynasties Period (420-589), there was a painter called Zhang Sengyou. Once he visited a temple and painted on the wall four dragons, but gave none of them eyes. The onlookers felt that this was odd, and asked why he hadn't painted the eyes. He answered, 'Eyes are crucial for dragons. With the eyes painted on, the dragons would fly away.' Nobody believed this, so Zhang Sengyou took up his brush and added eyes to two of the dragons. No sooner had he finished than the two dragons flew into the sky amid a thunderstorm. The two without eyes stayed painted on the wall.
中国是一个拥有悠久历史和丰富文化的国家，位于亚洲东部，是世界上人口最多的国家之一。中国的历史可以追溯到5000多年前，是世界上最古老的文明之一。下面以《介绍中国》为主题，分享5篇英语作文，供大家参考哦。
《介绍中国》英语作文 篇一：
China, officially known as the People's Republic of China, a vast country located in Eastern Asia. It is the world's most populous nation, with over billion people. China has a rich history that spans over 5,000 years, making it one of the world's oldest continuous civilizations. The Great Wall of China, the Forbidden City, and the Terracotta Warriors are just a few examples of the country's many remarkable historical sites. China is also known for its diverse cuisine, traditional arts, and martial arts practices.
中文翻译：中国，正式名称为中华人民共和国，位于东亚地区，是世界上人口最多的国家，拥有超过14亿人口。中国有着5000多年的悠久历史，是世界上最古老的连续文明之一。中国的长城、故宫和兵马俑只是国家众多非凡历史遗址的其中几个例子。中国还以其多样的美食，传统艺术和武术实践而闻名。
《介绍中国》英语作文 篇二：
The economy of China is the second-largest in the world, and it is well known for its rapid industrialization and significant contributions to global trade. Major industries include manufacturing, agriculture, and technology. The country is the world's largest exporter and has been the world's largest trading nation since 2013. China is home to some of the most famous and innovative companies, including Alibaba, Tencent, and Huawei.
中文翻译：中国的经济是世界第二大经济体，以其快速的工业化和对全球贸易的重大贡献而闻名。主要产业包括制造业、农业和科技。该国是世界上最大的出口国，自2013年以来一直是世界上最大的贸易国。中国是一些最著名和创新的公司的所在地，包括阿里巴巴、腾讯和华为。
《介绍中国》英语作文 篇三：
China has a diverse landscape that ranges from the highest peak, Mount Everest, along the border with Nepal, to the vast deserts of the Gobi and Taklamakan. It also includes large plains, impressive rivers such as the Yangtze River, and beautiful lakes like West Lake. This extensive variety of landscapes makes China a popular travel destination for tourists, offering countless opportunities to explore natural wonders, historical relics, and cultural experiences.
中文翻译：中国拥有丰富多样的地形，从与尼泊尔接壤的最高峰珠穆朗玛峰，到辽阔的戈壁和塔克拉玛干沙漠。还包括大片平原，如长江这样令人印象深刻的河流，以及西湖等美丽的湖泊。这种广泛的地形多样性使中国成为游客的热门旅游目的地，为探索自然奇观、历史遗迹和文化体验提供了无数机会。
《介绍中国》英语作文 篇四：
One of the most distinctive aspects of Chinese culture is its rich tradition of performing arts. These include traditional Chinese opera, acrobatics, and dance. Peking Opera, Kunqu Opera, and Yue Opera are popular forms of Chinese opera that incorporate singing, dancing, martial arts, and elaborate costumes and makeup. The Chinese New Year celebrations and Dragon Boat Festival are some of the most significant events in China, showcasing the country's vibrant culture and customs.
中文翻译：中国文化最独特的方面之一是其丰富的表演艺术传。这些包括传统的中国戏曲、杂技和舞蹈。京剧、昆曲和越剧等是中国戏曲的流行形式，融合了歌唱、舞蹈、武术以及华丽的服装和妆容。中国新年庆典和端午节是中国最重要的活动，展示了中国充满活力的文化和习俗。
《介绍中国》英语作文 篇五：
The Chinese language, also known as Mandarin, is the most widely spoken language in the world. It is a tonal language with a unique writing system consisting of thousands of characters. Chinese calligraphy, the art of writing Chinese characters, is highly regarded and considered an essential skill in traditional Chinese culture. Alongside the language, Confucianism, Taoism, and Buddhism have all significantly influenced Chinese philosophy, art, and culture throughout its history.
中文翻译：汉语也称为普通话，是世界上使用最广泛的语言。这是一种有声调的语言，拥有一个由成千上万个字符组成的独特的书写系统。中国书法，即书写汉字的艺术，在中国高度受到尊重，并被认为是中国传统文化中不可或缺的技能。除了语言外，儒家、道家和佛教在整个历史上都对中国哲学、艺术和文化产生了重要影响。
As is know to anybody, China has a long history of 5000 years, which turns out rich culture and special style. It’s said that every corner of Chinese ancient history was filled with varieties of prominent art works. All this influences people here by giving them a lot of feelings, experiences, images and ideas about life. But China also had a troubled past since 1840. She saw a lot: Xinghai Revolution against feudal dynasty in 1911,the anti—Japanese war during 1937—1945, the civil war broken out in big events brought pains, poverty to Chinese people, but they never gave in . Oppositely, people learnt not to weep when faced the hardship. They were taught to be strong enough to solve each problem. It’s the troubled time that create the valuable character for Chinese people. Finally they were succeed in rebuilding and developing the was founded as an independent country named People’s Republic of China in 1949 . After that, it began to its door to the world and built bridges of friendship with many other countries. Since then, China set its steps of fast development on all the sides, especially in the field of science and technology. We can say that new Chinese history is filled with great achievements. To exploring space, the CSA has developed the highly successful Long March rocket series. At present the scientists are preparing for the nation’s first manned space flight flying to the moon. In the field of genetic research, China also plays an impor ...
写作思路：确立中心，围绕选材，确定重点，安排详略，选材时要注意紧紧围绕文章的中心思想，选择真实可信，新鲜有趣的材料，以使文章中心思想鲜明深刻地表现出来。具体如下：
China，one of the four oldest civilizations in the world，has a written history of 4，000 years and boasts rich cultural relics and historical sites It is the inventor of compass，paper－making，gunpowder and printing The Great.
Wall，Grand Canal and Karez irrigation system are three great ancient engineering projects built 2，000 years ago Now they are the symbols of the rich culture of the Chinese nation China has gone over a long history of primitive.
society，slavery society，feudal society and semi－feudal semi－colonial society and the present socialist societyCondensed China is an introduction to Chinese history.
中国是世界四大文明古国之一，有着4000年的文字历史，拥有丰富的文物古迹。它是伟大的指南针、造纸、火药和印刷术的发明者。
长城、大运河和坎儿井灌溉系统是建于2000年前的三大古代工程。现在他们是中华民族丰富文化的象征。中国有着悠久的原始文明历史。
封建社会、奴隶制社会、封建社会、半殖民地社会。现在的社会主义社会。浓缩中国是中国历史的导论。
关于历史文化的英语作文
直接去百度百科里搜西安，从里面摘要点翻译一下。Xi'an is an ancient city with a rich history and culture that has influenced the region for over 3,000 years. The city served as a capital of many dynasties in China's history, including the Qin, Han, Tang, and Ming Dynasties. As a result, Xi'an is home to numerous historical sites and cultural artifacts that attract tourists from all over the of the most famous attractions in Xi'an is the Terracotta Warriors and Horses, which date back to the Qin Dynasty (221-206 BC). This incredible archaeological site includes thousands of life-sized terracotta figures of warriors and horses that were buried with the first emperor of China, Qin Shi important site in Xi'an is the City Wall, which was built during the Ming Dynasty (1368-1644) and still stands today. The wall encloses the old part of the city and offers great views of the surrounding addition to these famous sites, Xi'an also has a rich cultural heritage. For example, the Tang Dynasty (618-907) was a golden age of Chinese culture and art, and many of its achievements are still celebrated in Xi'an today. These include traditional music, dance, and theater performances, as well as stunning art and , Xi'an is also known for its delicious food, with many unique dishes that reflect the city's long history and diverse cultural influences. Some popular local specialties include Yangrou Paomo (a soup made with lamb and bread), Biang Biang Noodles (thick, chewy noodles served with a spicy sauce), and Roujiamo (a type of sandwich made with marinated meat in a flatbread).Overall, Xi'an is a city full of history and culture, with something to offer for everyone who visits. Whether you're interested in ancient artifacts or modern cuisine, Xi'an has it all, and it's definitely worth a visit if you're planning a trip to China.
For centuries,Shanghai is only a small fishing village until the 13th century,it developed into 751 years,in today's Songjiang county executive first built,as Huating County; to the Sung Dynasty (AD 991),South Shore Qingpu Northeast have Songjianghe Qinglong facilitate traffic,the Merchant Shipping have chosen today for the Huangpu Bund docked at the pier,River West Bank cities was gradually replaced by an emerging Qinglong Town,a new port and business the Southern Song Dynasty (AD 1260-1274),the increasing importance of Shanghai,the Merchant Shipping gathered here,filled with 1292,the Executive Yuan dynasty established in this county,to the Ming dynasty has become the country's textile and handicraft centers,and built the first Qing government in the year 1685 established the Shanghai Customs,from an international big business center developed. over
Culture of Xi'an 2008-01-25 The culture of Xi'an is inherited from the traditions of one of the world's earliest Guanzhong Ren (关中人/关中人) were the cultural antecedent of Xi'anese,their cultural features are drawn from the Ten Specialties of Guanzhong Ren (关中十大怪/关中十大怪).Another major part of this culture is Eight Great Sights of Chang'an (长安八景/长安八景),storied scenic areas in the region. The drama of the original Xi'anese culture,Qinqiang (秦腔,Voice of Qin) is the oldest and most extensive Chinese Opera of the four major types of Chinese dialect of Xi'an is Shaanxi Hua,which is strongly influenced by Standard Mandarin,but still retains much grammar and pronunciation from the Classical of its long development as a culture,the cuisine of Xi'an is extensive as is the representative of food of Northwestern most well known local food is the Xi'anese snack,a traditional food of the Hui snacks feature beef and mutton because the Hui people,being Muslims,do not eat beef and mutton,buns with beef,and other such regional dishes that are usually spicy in nature and incorporate a lot of beef and mutton particularly famous Xi'an dishes include a pancake and mutton soup,which can be optionally spicy,and Xi'an's famous hand-rolled noodles,which e in various flavors,shapes,and is also a famous cultural noodle dance when a chef,instead of rolling out noodles,waves a long strip of dough around in a dance before cooking the noodles.
Xi’an, located in the middle of China, is a city with a long history and rich cultural heritage. It served as the capital for many of China’s ancient dynasties and played an important role in the country’s ’an was the starting point of the Silk Road, an ancient trade route that connected China to the Mediterranean world. As a result, it became a melting pot of cultures and religions, including Buddhism, Islam, and Christianity. The city has many historical sites that reflect its diverse cultural influences, such as the Terracotta Warriors and Horses, the Big Wild Goose Pagoda, and the Great Mosque of Xi’ Terracotta Warriors and Horses, discovered in 1974, are considered one of the greatest archaeological finds of the 20th century. The life-sized clay figures were created to guard the tomb of Emperor Qin Shi Huang and are now a UNESCO World Heritage Big Wild Goose Pagoda, built in the Tang Dynasty (618-907), is another famous landmark in Xi’an. It was originally built to house Buddhist scriptures brought back from India by the monk Xuanzang, and it has since become an important symbol of Chinese Great Mosque of Xi’an, built during the Tang Dynasty, is one of the oldest and largest mosques in China. Its unique combination of Chinese and Islamic architectural styles reflects the city’s multicultural addition to these historical sites, Xi’an also has a rich cuisine that dates back thousands of years. It is famous for its dumplings, noodles, and roujiamo, a type of Chinese hamburger. These dishes reflect the city’s long history and cultural conclusion, Xi’an’s history and culture are deeply rooted in China’s ancient past and its position as a hub of international trade and cultural exchange. Whether you are interested in history, religion, or food, Xi’an has something to offer everyone.
