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
85
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
RecentlyaBJinformationcompanydidasurveyofstudentlifeamongmoreth
[originaltext]W:Howmucharethesepillows,please?M:Fourdollarseachorse
下列句子中,代词使用不当的有( )。A.我从小养成了独立生活的能力,父母对自己
关于施工总布置应遵循的原则,下列说法错误的是( )。A.施工场地布置应与交通运
男,32岁,腹外伤,休克。经抗休克治疗好转。24小时后发生休克,最可能的原因是A
下列哪味药物既能治疗肝肾不足,目失所养的目暗不明,又能治肝肾不足的胎动不安A.续
孕妇禁用的中成药处方药是A.四神丸B.木瓜丸C.九一散D.牛黄降压丸E.小柴胡片
肾结核病人行全肾切除术后护理指导中不妥的是A.半卧位 B.卧床7~14天,减少
7天足月新生儿,生后3天开始面部及巩膜黄染,渐波及躯干,吃奶及精神好,RBC5.
在深圳证券交易所,开放式基金份额申购、赎回结果的确认由()负责。A:证券交易所
最新回复
(
0
)