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
2023-08-30
43
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?
转载请注明原文地址:https://tihaiku.com/zcyy/2970611.html
相关试题推荐
[originaltext]Magnificent,peaceful.Justtwowordstodescribethesceni
[originaltext]W:Hello,Michael.Wouldyoucometomyofficeforaminute?Iwa
[originaltext]W:Hello,Michael.Wouldyoucometomyofficeforaminute?Iwa
[originaltext]F:SusanBauerspeaking.M:Dr.Bauer,mynameisTomWhite.Myr
[originaltext]F:SusanBauerspeaking.M:Dr.Bauer,mynameisTomWhite.Myr
[originaltext]W:Howdoyoulikeyournewtenantwhomovedtoyourapartmentla
[originaltext]W:Howdoyoulikeyournewtenantwhomovedtoyourapartmentla
[originaltext]W:Howdoyoulikeyournewtenantwhomovedtoyourapartmentla
[originaltext]W:Howdoyoulikeyournewtenantwhomovedtoyourapartmentla
[originaltext]W:Howdoyoulikeyournewtenantwhomovedtoyourapartmentla
随机试题
【S1】[br]【S4】many→few上文提到“地震学是一门比较新兴的科学研究”,因为“直到18世纪有关地震的真实描述几乎还没有什么(few)记载”。逻辑
Themajorityoftheboardmanagreedwiththeproposalthat______(妇女在工作和生活中应得到公平
【B1】[br]【B6】A、divorcedB、separatedC、isolatedD、brokenA逻辑衔接题。既然是再次结婚,那么他们是离过婚
Recentlycertaincountermeasures__________(阻止破坏环境)havebeenintroducedtothep
患儿女,4岁。发热伴咳嗽3~4天,今出皮疹,住外院拟诊"药物疹",口服阿司咪唑(
在学校情境中,大部分问题的解决是通过各个学科中的具体问题来体现的。试结合实际,论
与今天的大熊猫不同,大熊猫祖先的饮食非常多元,那么大熊猫是从什么时候开始以食用竹
保险的原则包括()。A.诚信原则 B.可保利益原则 C.经济效益原则 D
(2018年真题)根据民事诉讼法律制度的规定,下列民事纠纷中,当事人不得约定纠纷
为规范项目成本管理行为,管理行为控制程序所制定的约束和激励体系的主要内容有()
最新回复
(
0
)