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
51
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
AppealingforaDonationWriteanoteofabout50-60wordsbasedonthe
Unemploymentisadeeply【B1】______sensitivepoliticalissueforChancellor
《泡沬灭火系统施工及验收规范》》(GB50281)自()实施A.2006年6月
( )目的就是在出现故障的时候,依据事先约定的处理优先级别尽快恢复服务的正常运
下列关于病例-对照研究的说法正确的是A.比较病例组和对照组发病率的差异 B.比
男,25岁,被汽车压伤后立即送来急诊,查体:神智清楚,右下肢不能活动,明显肿胀疼
A.羊毛脂 B.淀粉 C.丙二醇 D.EVA E.PVA可做增塑剂使用的
有腐蚀建筑物,污染河流,造成土地酸化等危害的是()。A.臭氧空洞 B.汽车
有规章制定权且属于国务院组成部门的行政机关包括()。A.自然资源部 B.国家
工程项目质量控制体系的建立过程中,首先应()。A.编制质量控制计划 B.明确系
最新回复
(
0
)