首页
登录
职称英语
[originaltext] What does maglev look like? Japanese engineers designed a veh
[originaltext] What does maglev look like? Japanese engineers designed a veh
游客
2023-07-13
64
管理
问题
What does maglev look like? Japanese engineers designed a vehicle that runs in a cradle-like track or guideway. Magnetic attraction and repulsion pull and push maglev forward. To stop the trains, the magnetic force is reversed, much like airplanes are stopped by reversing the force of the engines. Both types of maglev are quiet, fast, and save. Since maglev rides on air, there is no friction between wheels and rails to make noise or to slow it down. If the external power fails, there is a battery-operated system on the train itself that takes over and brings the cars to a smooth stop.
Maglev could be the answer to our problems. It could become the typical short and middle-distance mass transportation system of the twenty-first century. If it does, we will enjoy many benefits. We will ride in save, fast, quiet trains between cities up to about 500 miles apart in less time than it takes to fly if you include the time for ground transportation. We will conserve precious land because maglev can be built where railroads run, down the middle of existing super-highways or elevated above existing streets and roads. And we will probably save money, too. According to a German estimate, a mile of two-way track will cost about nine million dollars whereas a mile of interstate highway costs about 25 million dollars in the United States.
选项
A、Because it is designed like a cradle.
B、Because it is pulled and pushed by magnetic attraction and repulsion.
C、Because it runs on air.
D、Because there’s no friction between wheels and rails.
答案
D
解析
转载请注明原文地址:https://www.tihaiku.com/zcyy/2832396.html
相关试题推荐
[originaltext]Joeisastudentatacollegeinanopenarea.Duringhisfir
[originaltext]Myfriend,EmmaDaniels,spentthesummerof1974travelingi
[originaltext]Myfriend,EmmaDaniels,spentthesummerof1974travelingi
[originaltext]M:Ibelieveyouhavea1982Toyotaforsale.W:That’sfight.M:
[originaltext]M:Ibelieveyouhavea1982Toyotaforsale.W:That’sfight.M:
[originaltext]M:DidItoldyouwe’dfoundahouseatlast?W:Haveyou?Ithou
[originaltext]M:DidItoldyouwe’dfoundahouseatlast?W:Haveyou?Ithou
[originaltext]M:DidItoldyouwe’dfoundahouseatlast?W:Haveyou?Ithou
[originaltext]M:DidItoldyouwe’dfoundahouseatlast?W:Haveyou?Ithou
[originaltext]M:DidItoldyouwe’dfoundahouseatlast?W:Haveyou?Ithou
随机试题
ThefirstsettlementinAustraliawasmadebythe______.A、EnglishB、DutchC、Fre
用摆式仪测试摆值同一处平行试验不少于3次,每一处均取3次测定结果的平均值作为试验
社区护士定期到学校对青少年的生长发育进行检测和评价,不属于检查内容的是()。A
在具体的实践中,符合仲裁法对仲裁协议形式要件要求的仲裁协议包括()。A、典型规范
某公司目前的息税前利润为200万元,发行在外普通股200万股(每股1元),已发行
介水传染病的流行特点不包括( )。A.多为暴发流行 B.病例分布与供水范围一
施工成本分析的基本方法中,为了分析影响目标完成的积极和消极因素可通过( )方法
根据《烟花爆竹安全管理条例》的规定,烟花爆竹是指烟花爆竹制品和用于生产烟花爆竹的
根据《生产安全事故报告和调查处理条例》,事故调查组应履行的职责有()。A.查明事
保证合同的当事人为()。A.债权人与保证人 B.债权人与债务人 C.债
最新回复
(
0
)