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
2023-09-15
51
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 on 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. One train may stay 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、Workers on the platforms and trains were replaced by machines.
B、A completely automatic line was added to its network.
C、It became the first completely automatic railway in the world.
D、Its trains became manual-controlled.
答案
B
解析
What happened to the complete London underground railway thirty-eight years ago?
综合短文中的The world’s first completely automatic railway has been built under the busy streets of London.及and it is part of the complete London underground railway.…was opened in 1969可知,B为答案。
转载请注明原文地址:https://tihaiku.com/zcyy/3017001.html
相关试题推荐
[originaltext]25yearsago,RayAnderson,asingleparentwithaone-year-o
[originaltext]25yearsago,RayAnderson,asingleparentwithaone-year-o
[originaltext]M:Hi,Anna!Welcomeback!HowwasyourtriptotheStates?W:Ve
[originaltext]Waterscootersarewatervehiclesthatlookverymuchlikemot
[originaltext]Articlesinmagazinesandnewspapersandspecialreportsonr
[originaltext]W:Tellme,Peter,whatmakesHarold’ssofamous?M:Well,it’st
[originaltext]W:Tellme,Peter,whatmakesHarold’ssofamous?M:Well,it’st
[originaltext]W:Tellme,Peter,whatmakesHarold’ssofamous?M:Well,it’st
[originaltext]W:Hi,Kevin.M:Hi,Lora,longtimenosee.Whathaveyoubeenu
[originaltext]W:Hi,Kevin.M:Hi,Lora,longtimenosee.Whathaveyoubeenu
随机试题
Themergerwasexpectedtohelpthecombinedcompanyto[br]Onereasongivenfo
[originaltext]W:Hey,Henry,how’severythinggoing,andwhat’swiththeflower
[A]proponents[I]hemp[B]regained[J]essential[C]cultivated[K]opponen
17,29,43,61,87,()A.167 B.115 C.
混凝土小型空心砌块结构下列部位墙体,何项可不采用混凝土灌实砌体L洞?()A
从四个图中选出唯一的一项,填入问号处,使其呈现一定的规律性: A.如上图所示
2021年第一季度各月稀土及其制品出口额的同比增量排序正确的是:A.2月>3
运输结构的优化的最终目标就是争取以最少的投入取得最大的效益,这种广义的效益包括(
基础心理学是研究()。 (A)正常成人心理现象的心理学基础学科 (B
建筑市场诚信行为信息中的不良行为记录主要是指由( )所形成的记录。A.合同履行纠
最新回复
(
0
)