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
37
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
Ifinditeasiesttolookforwardbylookingbacktothe"GreatLaborMigra
如果一家公司不打算进行新的权益融资,且资本结构保持不变,那么该公司可能实现的增长
信息系统安全技术要求的四个方面主要包括物理安全、运行安全、信息安全、()A
学校应当把()放在首位,促进学生养成良好思想品德和行为习惯。A.知识教育 B
下列有关证券登记结算机构的说法,错误的有()。 ①投资者委托证券公司进行证券
下列具有抗菌、抗病毒、抗炎作用的药物,错误的是A.柴胡B.葛根C.薄荷D.桑叶E
与椎管内麻醉后头痛的特点相符的是()。A.可发生在穿刺后6~12小时 B.疼
机电工程施工方案交底内容包括()。A.施工工艺 B.施工程序和顺序 C
某孕妇26岁第一胎,孕16周时开始在村卫生室检查,血色素84g/L,血压、宫高正
《执业医师法》规定,医师因考核不合格者被责令暂停执业活动3~6个月,并接受培训和
最新回复
(
0
)