首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
There’s a simple idea that two of West Germany’s top car manufacturers seriously studying at the moment, both out of self intere
There’s a simple idea that two of West Germany’s top car manufacturers seriously studying at the moment, both out of self intere
admin
2010-04-28
82
问题
There’s a simple idea that two of West Germany’s top car manufacturers seriously studying at the moment, both out of self interest ,but also out of concern for the environment.
The concept is to develop vehicles that can run on a virtually limitless element hydrogen which when burned does not produce damaging fumes, but instead a bit of water vapour. The concept can solve two problems at once. First, it is a hedge for that day in the 21st century when hydrocarbon fuels run out, a prospect of no minor concern for the automotive industry.
Beyond that, the increasingly dire warnings by environmental scientists about the "greenhouse effect" in atomosphere caused by carbon dioxide exhausts adds urgency to the quest for a fuel that is less damaging to the environment.
Of course, there is a hitch to hydrogen, both carmakers admit :though the know -how to run vehicles on nature’ slightest element is already available, hydrogen is far from being cost competitive compared to hydrocarbon fuels, and further refinements hydrogen -propulsion technology will be required. But what we are discussing today is the technology of the year 2020.
But after several year’s research Daimler and BMW engineers, in collaboration with other companies and research institutes in West Germany, independently have been tackling the technological and cost feasibility problems to be overcome in hydrogen fuel application.
In addition to the two concerns of technology and economic feasibility, the carmakers say, there is the issue of safety. The spectacular explosion of the dirigible. Hindenburg in 1937 immediately comes to mind, and skeptics wonder what the German autobahn would look like in one of the hundred - car pileups that routinely happen every winter if all the cars and tanks loaded with hydrogen.
A BMW engineer, Friedich Fickel, says that hydrogen is seen as less risky than gasoline. When leaked, hydrogen rises quickly up to the atmosphere, reducing the potential of explosion, whereas gasoline fumes linger close to the ground before dispersing. Still, both Daimler and BMW report that a considerable part of their development efforts are aimed at safe, lead - free storage of hydrogen fuel.
The related question is what is the best method of storage. By now ,the tests by both carmakers have all but eliminated using hydrogen in gas form. As a gas it takes up about 14 times the space of liquid hydrogen and as much as 30 percent can be lost by leakege unless the tanks are perfectly sealed.
Two other storage methods hold more promise. One is in liquid form, and the other in the form of metal hydrides. In the latter, hydrogen if mixed with a metal alloy ,a process whereby the gas molecules are stored within the metal’s molecular structure.
Which of the following is the characteristic of hydrogen?
选项
A、It is nontoxic
B、It has lots of vapour.
C、It doesn’t produce damaging fuels.
D、It costs less.
答案
C
解析
在四个中B、D都不符合原文内容,而A在原文中没有详细说明,只有C在文中讲得很清楚。
转载请注明原文地址:https://kaotiyun.com/show/EMqO777K
0
专业英语八级
相关试题推荐
PresidentBushonWednesdayissuedhissecondvetoofameasureliftinghisrestrictionsonhumanembryonicstemcellexperiment
A、Quickchoicesarealwaysbaddecisions.B、Oneshouldalwaysthinktwicebeforemakingadecision.C、Lookingbackhelpsoneto
A、Theabilitytobethetopstudents.B、Theabilitytogethighmarksinalltheexams.C、Theabilitytogetonwellwithpeople
JohnGurdon’sschoolreportonhisabilitiesinscienceleftlittledoubt."Ithasbeen,"histeacheratEtonwrote,"adisastro
PlansforoneofBritain’sbiggesthousingdevelopments,of5,000homesworthhundredsofmillionsofpounds,mayhavetobeab
ThestoryofNokia’stransformationfromanobscureFinnishconglomerateintotheworld’slargestmakerofmobilephonesisano
GeorgeBushwaswidelyquotedoninternational【B1】______buthadratherlesstosayaboutthePlanof【B2】______totacklethe"s
A、Theconceptofsustainableutilizationandmanagementofnaturalresourceshasbeendenied.B、TheZimbabweangovernmentwould
A、Africanshavemanyopportunitiesofdevelopmentwhentheyareinthedrought.B、Africancountrieshavevastnaturalresources
WhichofthefollowingstatementsisINCORRECTaboutDavid’spersonalbackground?
随机试题
己知函数z=x2ey,则dz=________.
某初产妇,孕34周,因高血压160/110mmHg,下肢水肿(++)入院,化验:尿蛋白(+++),并伴有恶心呕吐等自觉症状。
男性,44岁,肝脏进行性肿大一个月,肝区疼痛明显,腹腔积液征(+),肝肋下6.0cm,质地硬,表面凹凸不平,脾肋下1.0cm,检查:AFP1000μg/L,AST80IU/L,最可能的诊断是
某宗房地产是在有偿出让的土地上开发建设的,当时获得的土地使用年限为50年,至今已使用了10年,预计利用该宗房地产正常情况下每年可获得收益6万元,该宗房地产的报酬率为8%。该宗房地产的收益价格为()万元。
一般项目可行性研究的内容,均应设专章论述投资必要性、技术可行性、财务可行性、组织可行性和风险分析的内容。对于非工业项目,重点评价()。
同事之间分享专业知识和工作经验,符合()的要求。
2017年1月1日起,对境外投资者从中国境内居民企业分配的利润,直接投资于鼓励类投资项目,凡符合规定条件的,实行递延纳税政策,暂不征收预提所得税。境外投资者按照规定可以享受暂不征收预提所得税政策但未实际享受的,可在实际缴纳相关税款之日起一定时期内申请追补享
下图表示某区域在一定时期内剩余劳动力数量、人均工资的变化,以及甲、乙两类企业在该区域维持最低经济效益所能支付人均工资的变化,读图,完成以下题。由图可以推断,该区域()。
心地;善良正确选项为()。
下列删除VLAN的命令中,无法执行的是()。
最新回复
(
0
)