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
47
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
[audioFiles]audio_eham_j10_001(20082)[/audioFiles]A、Becauseit’ssafer.B、Becau
Amsterdam,atriumphofresourcefulness,isthebiggestcityintheNetherla
用光useup
[originaltext]I’vementionedhowDNAhavesolvedmanymysteriesinbiology.
计算建筑物耗热量指标时所采用的室外计算温度应为()A.供暖期室外计算干球温度
血吸虫病在人体组织内所造成损害不包括A.肺炎 B.下肢象皮肿 C.静脉内膜炎
以下穴位中不属于任脉的是( )。A.中极 B.水沟 C.关元 D.气海
类风湿因子靶抗原是( )。A.IgG分子的重链恒定区 B.IgG分子的重链可
A.网织红细胞数增多B.Ham试验阳性C.血间接胆红素阳性,尿胆原、粪胆原增加D
期货公司在客户开户时,对于个人客户,应当()办理开户手续,签署开户资料。A.亲自
最新回复
(
0
)