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
83
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、A battery-operated system on the train will control and bring the cars to a smooth stop.
B、The magnetic attraction will hook the cars firmly.
C、The cars equipped with a device will run in a special guide way.
D、The internal power will keep the cars steady.
答案
A
解析
转载请注明原文地址:https://tihaiku.com/zcyy/2832397.html
相关试题推荐
[originaltext]Somepeoplehaveverygoodmemories,andcaneasilylearnqui
[originaltext]Whentheautomobilewasfirstinvented,fewpeoplethoughtof
[originaltext]InordertomanwinBritain,boththemanandthewomanmust
[originaltext]InordertomanwinBritain,boththemanandthewomanmust
[originaltext]M:Oh,Ken,Ihavebeenmeaningtotalktoyou.W:Hi,Denise!Wh
[originaltext]M:Oh,Ken,Ihavebeenmeaningtotalktoyou.W:Hi,Denise!Wh
[originaltext]W:So,haveyougotthebloodsamplesowecoulddoourgeneticr
[originaltext]W:So,haveyougotthebloodsamplesowecoulddoourgeneticr
[originaltext]W:So,haveyougotthebloodsamplesowecoulddoourgeneticr
[originaltext]W:So,haveyougotthebloodsamplesowecoulddoourgeneticr
随机试题
______isNOTaPuritanvalue.A、HardworkB、ThriftC、PietyD、RationD
Astronomy[img]2014m9s/ct_etoefm_etoeflistz_0514_20149[/img][br]ListentoTrac
下列关于排列图各部分组成意义的描述中,正确的有( )。A.左边的纵坐标表示影响
患者,女性,15岁,诊断为弥漫性单纯性甲状腺肿,甲状腺肿较明显,为其采取的主要治
交际型公关的特点是()。A.直接沟通 B.形式灵活 C.信息反馈快 D.
垄断价格是垄断组织在销售或购买商品时,凭借其垄断地位规定的、旨在保证获取最大限度
1927年,蒋介石政权设立“延警察支队安”,把各省、市、县的警察机关改为“公安局
贷款发放后,关于对保证人保证意愿的监控,做法错误的是()。A.应密切注意保证人的
施工单位对所承包项目的施工质量负责,在监理单位验收前对施工质量负()。A.部分
男,55岁,暴饮暴食后突发上腹痛伴寒战,高热3天,加重伴呕吐3天,查体:T39.
最新回复
(
0
)