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
2024-02-14
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://tihaiku.com/zcyy/3448662.html
相关试题推荐
[originaltext]AbrahamLincolnwasborninalogcabininKentuckyonFebruar
[originaltext]AbrahamLincolnwasborninalogcabininKentuckyonFebruar
[originaltext]Doctorssayangercanbeanextremelydamagingemotion,unles
[originaltext]Doctorssayangercanbeanextremelydamagingemotion,unles
[originaltext]Doctorssayangercanbeanextremelydamagingemotion,unles
[originaltext]The20thWinterOlympicshavejustendedinTurin,Italy.Butfor
[originaltext]The20thWinterOlympicshavejustendedinTurin,Italy.Butfor
[originaltext]W:We’dbetterbelookingforsalesondownjacketsandthermoun
[originaltext]W:We’dbetterbelookingforsalesondownjacketsandthermoun
[originaltext]Computersarebeingwidelyusedinmedicine.Themostcommon
随机试题
In116,anapparentlyinsignificanteventinaremotepartofNorthernEurope__
Breakfastisthefirst【B1】______oftheday.Wehavejuice,toastwithbutter
Thingshavechangedinyourlife.Mostnotably,youarenolongeremployed.
[originaltext]M:So,howlonghaveyoubeenaMarketResearchConsultant?W:We
已知某企业购货付现率为:当月付现60%,下月付现30%,再下月付现10%.若该企
用于治疗痛风病的药物有()。A:塞来昔布 B:别嘌醇 C:美洛昔康 D:
患者男,68岁,农民,无文化。胃癌手术后,护士在探视期间与其进行交谈,交谈过程中
学生缺乏学习动机可能是由于某种需要没有得到充分的满足,这种动机理论属于( )。
根据《城市绿化条例》的规定,( )应当从实际出发,根据城市发展需要,合理安排与
《物业管理条例》规定,应当按照国家规定的保修期限和保修范围,承担物业保修责任。担
最新回复
(
0
)