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
2023-09-10
13
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
综合预览选项可知,本题与铁路和火车的历史有关.本题询问三十九年前整个伦敦地下铁路发生了什么变化。综合文中首句介绍了世界上第一条完成的自动化铁路线,B为本题答案。
转载请注明原文地址:https://tihaiku.com/zcyy/3001855.html
相关试题推荐
[originaltext]Afewmonthsago,millionsofpeopleinLondonheardalarmsa
[originaltext]Afewmonthsago,millionsofpeopleinLondonheardalarmsa
[originaltext]M:Thecitycouncilhasfinallyvotedthefundstobuildanewhig
[originaltext]M:Thecitycouncilhasfinallyvotedthefundstobuildanewhig
[originaltext]M:Thecitycouncilhasfinallyvotedthefundstobuildanewhig
[originaltext]M:Thecitycouncilhasfinallyvotedthefundstobuildanewhig
[originaltext]M:Thecitycouncilhasfinallyvotedthefundstobuildanewhig
[originaltext]WhenpeterandRosecametotheUnitedStatesfromthePhilip
[originaltext]WhenpeterandRosecametotheUnitedStatesfromthePhilip
[originaltext]Todayschoolchildreninmanycountrieshavehighratesoffa
随机试题
[originaltext]Afewmonthsago,Iwasaskedtogiveatalkaboutfun.Thec
Therewere150________attheinternationalconferencethissummer.A、spectatorsB
(Ehime-ken)EhimeUniversityinMatsuyamaisseekingEnglishinstructorsfor
患者,女28岁。结婚2年不孕,月经先后不定期,23~56d一行,行经期3~7d,
女性,18岁,上呼吸道感染、高热,青霉素皮试阳性,宜选用下列何药治疗?A、红霉素
(2019年真题)某高层建筑的消防给水系统维护保养项目包括,(1)对减压阀的流量
各经办银行应按()将已到还款期的借款学生还款情况反馈给学校,学校负责协助经办银
某交易者以2.87港元/股的价格买入一张股票看跌期权,执行价格为65港元/股;该
乳尖牙过早拔除易造成( )。A.尖牙异位萌出 B.侧切牙异位萌出 C.中切
会计人员交接前的准备工作包括()。A、移交 B、监交 C、清理资料、公物
最新回复
(
0
)