首页
登录
职称英语
What happened to the London underground railway about three decades ago? [origin
What happened to the London underground railway about three decades ago? [origin
游客
2024-10-31
34
管理
问题
What happened to the London underground railway about three decades ago?
The world’s first completely automatic railway has been built under the busy streets of London. The railway is called the Victoria Line, and it is part of the complete London underground railway.
The new Victoria Line was opened in 1969. This new line was very different from the others.
The stations on the other lines need a lot of workers to sell tickets, and to check and to collect them when people leave the trains. This is all different of the Victoria Line. Here a machine checks and collects the tickets, and there are no workers on the platforms.
On the train, there is only one worker. If necessary, this man can drive the train. But usually he just starts it; it runs and stops by itself. The trains are controlled by electrical signals which are sent by the so-called "command spots". The command spots are the same distance apart. Each sends a certain signal. The train always moves at the speed that the command spots allow. If the command spot sends no signals, the train will stop.
Most of the control work is done by computers. The computers also fix the train’s speeds, and send the signals to the command spots.
Other machines make sure that the trains are always a safe distance apart. If one train stays too long at a station, the other trains will then automatically move slower. So there is no danger of accidents on the line.
选项
A、The workers on the underground platforms were replaced by machines.
B、It became the first completely automatic railway in the world.
C、A completely automatic line was added to its network.
D、Its trains became computer-controlled.
答案
B
解析
转载请注明原文地址:http://tihaiku.com/zcyy/3825081.html
相关试题推荐
Theaimoftheagreementisto______.[br][originaltext]TheCanadianpoli
Theaimoftheagreementisto______.[br][originaltext]TheCanadianpoli
Theaimoftheagreementisto______.[originaltext]TheCanadianpolicesay
Whatisspecialabouttheman’sbirthday?[br][originaltext]Jill:Whatareyou
Whatisspecialabouttheman’sbirthday?[originaltext]Jill:Whatareyourown
[originaltext]TheCreditCardintheU.S.Tod
Towhomweretheletterbombsintendedtosend?[br][originaltext]Sevenm
whenwilltheexamtakeplace?[originaltext]NowI’dliketotalktoyouab
What’sthematterwiththeman?[br][originaltext]F:So,howarethingsgoing
What’sthematterwiththeman?[br][originaltext]F:So,howarethingsgoing
随机试题
[img]ct_epem_epelisv_00671(20097)[/img][br][originaltext]F:I’dprefertheme
Itwasverykindofhim______thedoorforus.A、foropeningB、andopenC、toope
Theyknowundergroundlendingisvery______becauseofthehighinterestrates,b
[originaltext]W:Howdoyoufindyournewapartment?M:Well,it’squitenicere
农村土地产权制度沿革经历了以下过程:①农村土地集体所有制的建立;②农民土地所有制
(2018年)根据《企业会计准则第1号——存货》的规定,发出存货计价方法包括(
以下哪个是颌面部生长的快速期A.4~7岁,第一恒磨牙萌出 B.16~19岁,第
《中华人民共和国药品管理法》规定实行特殊管理的药品是A、麻醉药品、精神药品、医疗
血管扩张药改善心脏功能的原因是A.减轻心脏前后负荷 B.降低外周阻力 C.减
我国工程担保中,履约担保可以采用( )的形式。A.企业相互担保 B.履约担保书
最新回复
(
0
)