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
2023-07-12
55
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 a 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 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 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. If one train stays 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、In 1965.
B、In 1979.
C、In 1969.
D、In 1959.
答案
C
解析
转载请注明原文地址:https://tihaiku.com/zcyy/2829384.html
相关试题推荐
【B1】[br]【B10】[originaltext]Tousitseemsnaturaltoputupanumbrellat
【B1】[br]【B9】[originaltext]Tousitseemsnaturaltoputupanumbrellato
【B1】[br]【B8】[originaltext]Tousitseemsnaturaltoputupanumbrellato
【B1】[br]【B6】[originaltext]Tousitseemsnaturaltoputupanumbrellato
【B1】[br]【B5】[originaltext]Tousitseemsnaturaltoputupanumbrellato
[originaltext]Whentheyadviseyourkidsto"getaneducationifyouwantt
[originaltext]Whentheyadviseyourkidsto"getaneducationifyouwantt
[originaltext]Lightningisaflowofelectricityformedhighabovetheeart
[originaltext]Lightningisaflowofelectricityformedhighabovetheeart
[originaltext]Inarecentstudyofsix-andseven-year-oldsinthePhiladel
随机试题
[originaltext]Inthepastindustrieshadmorefreedomthantheyhavenow,a
JeffBezosTakingthelongviewA)JeffBezos,thefoundera
管材还可以按环刚度(kN/㎡)分类:SN2、SN4、SN6.3、SN8、SN12
简述“美术课程凸显视觉性”的内涵和途径。
激进型筹资策略的特点是()。A、增强企业偿债能力,降低利率变动风险 B、会使企
A题干图形中都含有4个封闭区域,选项中只有A项符合。
大补阴丸治疗紫癜的证候是( )。A.风热伤络证 B.血热妄行证 C.气不摄
夸美纽斯曾说过,教师的职责是用自己的榜样去教育学生。在言谈举止、为人之道等方面,
A.利水渗湿,安神 B.利水渗湿,退黄 C.利尿通淋,除痹 D.利尿通淋,
以下岩石形成的溶隙或溶洞中,常赋存岩溶水的是()。A.安山岩 B.玄武岩
最新回复
(
0
)