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
79
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://www.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
Since1895theNationalTrusthasworkedforthepreservationofplacesofh
GroverClevelandwasthefirstpresident______intheWhiteHouse.A、gotmarried
【B1】[br]【B11】[audioFiles]audio_eufm_j01_308(200910)[/audioFiles]Atthattime,
处理电子邮件除了使用浏览器登录方式进行操作之外,还可以使用电子邮件客户端软件进行
急性胆囊炎最严重的并发症是A.细菌性肝脓肿 B.胆囊积脓 C.胆囊坏疽穿孔引
下列与农业合作化有关的表述正确的是 A.在农业合作化的高潮中,中共公布了过渡时
相当于心室后负荷的是( )。A.心室收缩末期压 B.心室舒张末期压 C.主
A.充填物过高,有早接触 B.充填物悬突 C.牙髓状态判断错误 D.充填材
企业向银行借款时,如果银行要求一定比例的补偿性余额,则提高了借款的实际利率水平。
屏护和间距是最为常用的电气安全措施之一,按照防止触电的形式分类,屏护和间距应属于
最新回复
(
0
)