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
61
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
A、Shy:didn’texpecttherewouldbesomanybooks.B、Fourbooksarealottoborrowfromthelibrary.C、Sheisn’tsurehecounte
AllpeoplewillinglycametoAmericawiththeintentionofachievingabetterlife.Therewere______groupsofindenturedserv
ARVshaven’tbeenusedwidelytopreventHIVtransmissionorinfectionforlackofmoney.Bothmother-to-childtransmissionand
PartⅡReadingComprehension(SkimmingandScanning)Directions:Inthispart,youwillhave15minutestogooverthepassageq
A、Seemoreofher.B、Spendmoretimeinschool.C、Earnmoremoney.D、Getbettergrade.AWhatwouldJim’sgirlfriendpreferhimt
Cultureshockisaspecialdiseaseforpeoplewhohavesuddenlymovedtoaforeigncountry.Likemostillnesses,ithasitsown【
Excusesrepresentadesiretohangontothelifeyouhavenow.Anexcuseisanobstaclethatyouchoosetoplace【C1】______front
A、Fromyuppieclubs.B、Intheseafoodmarket.C、Inthesupermarket.D、OntheInternet.D根据“这些吃起来很安全的昆虫能从网上找到和订购”,选D。
ImprovingthebalancebetweentheworkingpartofthedayandtherestofitisagoalofagrowingnumberofworkersinrichWe
Directions:Forthispart,youareallowed30minutestowriteacompositiononthetopicToCurbSpending.Youshouldwriteat
随机试题
阅读《季氏将伐颛臾》中的一段文字,然后回答下列小题。孔子曰:“求!周任有言日:‘陈力就列,不能者止。’危而不持,颠而不扶,则将焉用彼相矣?且尔言过矣,虎兕出于柙,龟玉毁于椟中,是谁之过与?”将“陈力就列,不能者止”译成现代汉语,并说明这句话所
以下不能献血的情况中,错误的是
患儿,女,6岁。壮热不解,烦躁口渴,咽喉肿痛,伴有糜烂白腐,皮疹密布,色红如丹,疹由颈部开始,迅速遍及全身,压之褪色,舌面光红起刺,状如草莓,脉数有力。该患儿治疗时,可选用的方剂是
某糖尿病患者,其某些化验的意义,下列哪项是恰当的
4个月女婴。冬季出生,足月顺产,单纯牛奶喂养,未添加辅食。近半个月来较烦躁,夜间哭闹不安,多汗。体检:体重6kg,有颅骨软化。最可能的诊断是()
下列情况具有刑法上的因果关系的是:
信贷授权应遵循的基本原则不包括()。
H公司是一个高成长的公司,目前每股价格为20元,每股股利为1元,股利预期增长率为6%。公司现在急需筹集资金5000万元,有以下3个备选方案:方案1:按照目前市价增发股票250万股。方案2:平价发行10年期的长期债券。目前新发行的10年期政府债券的到期收
设f(x)=ex-∫0x(x-t)f(t)dt,其中f(x)连续,求f(x).
某模拟网站的主页地址是:HTTP://LOCALHOST:65531/ExamWeb/INDEX.HTM,打开此主页,浏览“航空知识”页面,查找“超七战斗机”的页面内容,并将它以文本文件的格式保存到考生目录下,命名为“chao7.txt”。
最新回复
(
0
)