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
2024-06-12
15
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
What happened to the complete London underground railway thirty-nine years ago?
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/3631009.html
相关试题推荐
[originaltext]AlbertSchweitzerwasbornin1875inAlsace.Atthattime,i
[originaltext]Undernormalconditionstheactofcommunicationrequiresthe
[originaltext]Undernormalconditionstheactofcommunicationrequiresthe
[originaltext]BillGates,theheadoftheworld’sbiggestcomputersoftware
[originaltext]M:Whydoyouthinkthatway?W:WhileIadmitthereisverylitt
[originaltext]GeneralizingabouteducationintheUnitedStatesinvolvesso
[originaltext]GeneralizingabouteducationintheUnitedStatesinvolvesso
[originaltext]GeneralizingabouteducationintheUnitedStatesinvolvesso
[originaltext]GeneralizingabouteducationintheUnitedStatesinvolvesso
[originaltext]Yourprofessorhasaskedmetotalktoyoutodayabouttheto
随机试题
InSeptember,morethanadozenwhalesbeachedthemselvesintheCanaryIsla
“模仿说”的观点认为( )。A.艺术起源于劳动 B.艺术是“社会生活的再现”
某镇卫生院对3种慢性疾病筛查结果如下:高血压1613例,糖尿病592例,冠心病2
现场心肺复苏基本程序--基础生命维护期A、B、C
决定经济增长的基本因素包括()。A.劳动的投入数量 B.资本的投入数量 C.
土地所有权权能的分离与复归是土地所有者行使土地()的一种表现。A.使用权 B
直线制结构的优点包括( )。A.结构简单,指挥系统清晰、统一 B.责权关
政府的公共支出()。 A.只能用于提供公共产品 B.只能用于提供部分混合产
通货膨胀实质是一种货币现象,表现为商品和生产要素价格总水平在一定时期内()。A.
34岁已婚妇女,孕39周,规律宫缩10小时,破膜3小时入院。检查宫缩持续20-2
最新回复
(
0
)