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、The workers on the underground platforms were replaced by machines. B、It became the first completely automatic railway in the
A、The workers on the underground platforms were replaced by machines. B、It became the first completely automatic railway in the
admin
2013-01-22
64
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; and 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、The workers on the underground platforms were replaced by machines.
B、It became the first completely automatic railway in the world.
C、A completely automatic line was added to its network.
D、Computers began controlling the trains on the line.
答案
C
解析
What happened to the London underground railway?
转载请注明原文地址:https://kaotiyun.com/show/H2I7777K
0
大学英语六级
相关试题推荐
A、It’sanotherwaytoloseweight.B、It’sverycheap.C、It’snotsocrowded.D、It’snearby.D女士说娱乐中心离她的住处很近,故选D。
Bloggingisapastimeformany,evenalivelihoodforafew.Forsome,itbecomesan【36】Suchbloggersoftenfeelcompelledtowr
A、Itencouragedpeopletoinvent.B、Itprotectedpeople’sinvention.C、Itpublicizedideasthatmightbekeptastradesecrets.
Asmostparentsofsmallchildrenwillreluctantlyadmit,nothingcanoccupyachildquiteliketelevision.Unfortunately,thes
A、Theshortageofwillingdonors.B、Theobtainingofmoralapproval.C、Thecomplextechnicalprocedure.D、Therejectionfromthe
A、Theshortageofwillingdonors.B、Theobtainingofmoralapproval.C、Thecomplextechnicalprocedure.D、Therejectionfromthe
A、It’stheman’sbirthdaytoday.B、Theywillhavedinneraround6.C、Theywillhaveapartyfortheman.D、Theywillgotomovie
A、Thenearestrestaurant.B、Thefurnishedrestaurant.C、AFrenchrestaurant.D、Thenearestsupermarket.C语义理解题。男士询问女士去哪儿吃饭,并说最近的
TheInternet,e-commerceandglobalizationaremakinganeweconomicerapossible.Bythemiddleofthe21stcentury,capitalist
随机试题
慢性肾炎综合征的特点有()(1999年)
A.纸片扩散法B.E-test试验C.琼脂纸片洗脱法D.微量棋盘稀释法E.绝对浓度法快速生长分支杆菌体外抗菌药物敏感性试验方法
囟门迟闭下列哪种疾病多见( )。
男孩,9岁,奔跑时跌倒,右肘着地摔伤1小时。查体:右肘肿胀,功能受限,异常活动,肘后三角正常,手部青紫、皮温低,拇指对掌功能障碍。最常见的晚期并发症是
王老汉在玻璃计量厂工作多年,长期接触和使用金属汞对量器进行校正。两年前,王老汉出现了全身乏力、失眠、牙齿松动等症状。没过多长时间,他脾气开始变得暴躁、易怒,家人以为他得了精神病。为了确定汞中毒应进行哪项实验室检查
某民警在一次执行公务中牺牲,被公安部授予“一级英模”称号,并奖励奖金1万元,奖金由民警家属代领,同时其家属还收到全国各地捐款共达10万元。对该民警家属的11万元所得应否纳税存在下列几种意见,请问哪一种是正确的?
基金托管人召集基金份额持有人大会的,应至少提前()日公告大会的召开时间、会议形式、审议事项、议事程序和表决方式等事项。
在商品流通企业经营活动中,采购商采购时首先考虑的标准一般是()。
组织应建立关键绩效测量系统监测其实施进展情况,预测关键绩效与()相比较。
当讲述自己幼年读书的时光时,作者_______的叙事,使人有如临其境之感,好像也回到了童年读书时代,并从中受到了强烈的_______。填入划横线部分最恰当的一项是()。
最新回复
(
0
)