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
2023-08-27
81
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.
22. What happened to the London underground railway over four decades ago?
23. Who checks and collects the tickets on the Victoria Line?
24. What is the task of the one worker on the Victoria Line train?
25. What will happen on the line if each train moves at its own speed?
选项
A、There will be danger of accidents on the line.
B、The train will run off the rails.
C、Their speeds will be automatically fixed by the computers.
D、The train will keep a safe distance from each other.
答案
A
解析
推理判断题。短文指出会有机器设定火车的速度,使其保持安全距离,这样就不会有碰撞的危险。由此可知,如果每列火车都按自己的速度任意行驶,不互相照应,就会有发生事故的危险。
转载请注明原文地址:https://tihaiku.com/zcyy/2961043.html
相关试题推荐
[originaltext]Mr.Stevensonwastheownerofageneralappliancestore.He
[originaltext]Mr.Stevensonwastheownerofageneralappliancestore.He
[originaltext]Americanslearnsportsaspartoftheireducation.Theylearn
[originaltext]Americanslearnsportsaspartoftheireducation.Theylearn
[originaltext]Somedesertanimalscansurvivetheverystrongsummerheata
[originaltext]W:Whatdidyouthinkaboutthemovie?M:Well...IthinkHarryP
[originaltext]M:First,Iwanttothankyouforagreeingtothissurvey.Thisi
[originaltext]M:First,Iwanttothankyouforagreeingtothissurvey.Thisi
[originaltext]M:Doyouknowwhetherourhealthinsurancecoversexpensesford
[originaltext]M:Doyouknowwhetherourhealthinsurancecoversexpensesford
随机试题
ManypaintingsoftheAmericanSouthwestconveyafeelingofisolationandlonel
NearlyhalfofUSemployersresearchtheonlineprofilesofjobcandidateso
26岁初孕妇,妊娠39周,不规律宫缩有3日,阴道少许血性黏液,查:血压135/9
从下泪点冲洗,水自上泪点射出,压力较大,鼻咽部无水。此为A.下泪小管阻塞 B.
根据《合同法》,下列关于定金的说法,正确的是()。A.债务人准备履行债务时,定金
患儿8岁,反复发作性短暂意识丧失,动作中止。智力基本正常为明确诊断应首选的辅助检
共用题干 某一房地产开发公司A公司拟获得某城市规划区内一地块建设商品住宅。某职
A.休克 B.水中毒 C.双侧肾盂输尿管梗阻 D.蛇咬伤 E.尿毒症可引
从所给的四个选项中,选择最合适的一个填入问号处,使之呈现一定的规律性:
如某公司以单利方式借入500万元,年利率10%,第4年末偿还,则第4年本利和是(
最新回复
(
0
)