首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
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 t
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 t
admin
2013-06-02
55
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://kaotiyun.com/show/Re67777K
0
大学英语六级
相关试题推荐
HereTheyComeMostoftheimmigrantscamebecausetheywerehungry—hungryformorebreadandforbetterbread.Americaoffe
Directions:Farthispart,youareallowed30minutestowriteacompositiononthetopic:OverseasStudyatanEarlyAge.Yous
BillGatesbelievesthattheAmericanhighschoolsare"obsolete"in______.Inordertocompetewithoverseasstudents,America
InatypicaldayofLaineCaspi,shespendsmostofhertime________.Theauthorusesthestatisticsinthefourthparagrapht
A、Becausemenarelesslikelytobewellarmedwhentheybend.B、Becausemenseemmoreobedientwhentheybend.C、Becausemenmo
Directions:Forthispart,youareallowed30minutestowriteacompositiononthetopicShouldAdvertisementsBeBanned?Yous
A、Thosewholiketalkingaboutcheerfulthingslivetogether.B、Thosewhoavoidtalkingaboutcheerfulthingsdiesooner.C、Thos
Theestablishmentofthemoderncorporatestructurestarted______.WhatdidtheEastIndiaCompanygetfromBritishsovereign
Excusesrepresentadesiretohangontothelifeyouhavenow.Anexcuseisanobstaclethatyouchoosetoplace【C1】______front
A、Theywon’tbeabletosetupanautomobilecompany.B、Theywon’tbeabletocometotheopeningceremony.C、Theyshouldn’thav
随机试题
--Neverthoughttomeetyouhere.--______.
痰镜检下列哪项是正常的
被狂犬咬伤后,影响其是否发病的主要因素有
下列模型中,()模型是在一定的经济假设下,依据一定的经济理论,建立众多经济变量之间的关系式,利用变量的历史序列数据对关系方程式组成的联立方程组进行回归分析运算,确定方程式中的经济参数,从而得出方程的确定形式。
表征土在挖掘后体积增加的性质,可以用参数()表示。
南朝的四个连续的政权宋、齐、梁、陈都建都于______。
能力的补偿是指同一个体的不同能力之间或组织内部成员之间能力的相互替代或补偿作用,从而保持或维持活动的正常进行。其中辐射补偿是指优势能力有效地加强了各种能力之间的相互联系或带动其他能力同时提高的现象。放大补偿是指优势能力的高度发展,有效地弥补某些薄弱能力的现
京杭大运河,是世界上里程最长、工程最大、最古老的运河之一,与长城并称为中国古代的两项伟大工程。大运河北起北京(涿郡),南到杭州(余杭),途经北京、天津两市及河北、山东、江苏、浙江四省,贯通_______五大水系,全长约1704千米,开凿到现在已有2500多
以下叙述中正确的是
(1)Ifyouwanttoseewhatittakestosetupanentirelynewfinancialcenter(andwhatisbestavoided),headforDubai.Th
最新回复
(
0
)