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
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、To drive the train after it is started automatically.
B、To start the train and to drive it when necessary.
C、To take care of the passengers on the train.
D、To send commanding signals to the command spot.
答案
B
解析
What is the task of the one worker on the Victoria Line train?
转载请注明原文地址:https://tihaiku.com/zcyy/2970613.html
相关试题推荐
[originaltext]Asthetwentiethcenturybegan,theimportanceofformaledu
[originaltext]PeoplefellinlovewithElizabethTaylorin1944,whenshes
[originaltext]W:Hello,Michael.Wouldyoucometomyofficeforaminute?Iwa
[originaltext]F:SusanBauerspeaking.M:Dr.Bauer,mynameisTomWhite.Myr
[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
随机试题
[img]2011q1/ct_etoeicwm_etoeicwtpzj_0005_20111[/img]Themaniscarryingthebott
Theyare______studentsthattheyallperformedwellinthefinalexaminations.A、
PlansforoneofBritain’sbiggesthousingdevelopments,of5,000homeswor
Thereweretimes______(我尽量避免去想那些令人不快的事).whenItriedtoavoidthinkingabout
所示为单跨双层框架,因柱抗弯刚度不同,梁跨中弯矩最小的位置是( )。 A.Ⅰ
关于复合通风系统,下列描述中哪项是错误的?()A.复合通风系统是自然通风与机
根据投资者的行为主体不同,可以把投资者分为()。 ①公司 ②金融机构 ③
工程项目分部工程质量验收合格的基本条件有()。 A、主控项目质量经抽样检验
有机溶剂用量少而提取效率高的提取方法是A.渗滤法B.冷浸法C.回流提取法D.连续
股票收购是指收购方公司以()替换目标公司的股票。A:已发行的股票B:新发行的股
最新回复
(
0
)