首页
登录
职称英语
[originaltext] The world’s first completely automatic railway has been built
[originaltext] The world’s first completely automatic railway has been built
游客
2024-06-07
3
管理
问题
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 spot 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 spots send no signal, 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. One train may stay too long at a station, the other trains will then automatically move slower. So there is no danger of accident 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:https://tihaiku.com/zcyy/3623533.html
相关试题推荐
[originaltext]Manychildrenfirstlearnthevalueofmoneybyreceivingan
[originaltext]Manychildrenfirstlearnthevalueofmoneybyreceivingan
[originaltext]TheyoungexecutiveweavingthroughthetrafficinhisBMW,o
[originaltext]TheyoungexecutiveweavingthroughthetrafficinhisBMW,o
[originaltext]TheyoungexecutiveweavingthroughthetrafficinhisBMW,o
[originaltext]W:Morning,Mr.Park.M:Comehere,MissLi,Ihavesomethingto
[originaltext]W:David,sorryformyschoolboardmeetinglastnightsolate.I
[originaltext]W:David,sorryformyschoolboardmeetinglastnightsolate.I
[originaltext]M:Howdoyoulikethissuit?Withthisnewjob,I’vegottostar
[originaltext]M:Howdoyoulikethissuit?Withthisnewjob,I’vegottostar
随机试题
Thehonestjournalisthaskeptinvestigatingthathighrankofficialforalong
在同一流动气流中,当地音速c与滞止音速c0的关系为( )。A.c永远大于c0
呋喃唑酮又称为A.痢特灵 B.甲氧苄啶 C.呋喃坦啶 D.颠茄磺苄啶 E
A.滞产 B.痛经 C.丹毒 D.呃逆 E.便秘次髎穴的主治病证是(
用于鉴别甲型强心苷的试剂是A.碘化铋钾B.碱性苦味酸C.molish试剂D.氢氧
( )是按工作负荷量和岗位负荷系数标准决定岗位设置和人员定员。A.排队法 B
公司信贷的提供主体和接受主体分别是()。A.银行、公司 B.银行、法人和其他
A.甲氧苄啶 B.磺胺多辛 C.呋喃唑酮 D.磺胺嘧啶 E.环丙沙星对铜
江苏A外贸公司向埃及出门一批价值为50000美元的智力玩具,该批货物由浙江B工厂
医学伦理学作为学科出现的标志是() A.《黄帝内经》 B.宋国宾《医业伦理学
最新回复
(
0
)