首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
A、To drive the train after it is started automatically. B、To start the train and to drive it when necessary. C、To take care of t
A、To drive the train after it is started automatically. B、To start the train and to drive it when necessary. C、To take care of t
admin
2012-12-13
62
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、To drive the train after it is started automatically.
B、To start the train and to drive it when necessary.
C、To take care of the passengers on the train.
D、To send commanding signals to the command spot.
答案
B
解析
What is the task of the ore worker on the Victoria Line train?
转载请注明原文地址:https://kaotiyun.com/show/Ypb7777K
0
大学英语六级
相关试题推荐
ThesuddendeathofthatTVpersonality______apublicdebateonthestricterpunishmentofdrunkdriving.
Itisbelievedthattoday’spopmusicservesasacreativeforceby______thethinkingofitslisteners.
Hecanchoosefromdifferentjobsandprobablychangeshisworkmorefrequentlyasheisnot______toachoicewithinasmallr
Justasabookoftenjudged________bythequalityandappearanceofitscover,apersonisjudgedimmediatelybyhisappearanc
Theconspiratorswereplottingthe______ofthepresentgovernment.
Sibylwasthemost______,helpful,andgenerouspersontoworkwith.
Becauseofhisfamilybackground,hehasa________againstbusinessmen.
A、Theprofessor’sclassisveryboring.B、Theprofessor’sclassisveryinteresting.C、Onecupofcoffeeisenoughforhimtoke
A、Todrivethetrainafteritisstartedautomatically.B、Tostartthetrainandtodriveitwhennecessary.C、Totakecareoft
Johnwishes______(他当时没有失去出国的机会).
随机试题
传热系数的物理意义是什么?
男性,25岁,急性阑尾炎发病已4天,腹痛稍减轻,但仍发烧,右下腹可触及有压痛的肿块,应
34岁女性,葡萄胎2次清宫后,阴道不规则流血持续存在,尿HCG(+)。若B超发现子宫肌层呈蜂窝样改变应考虑为
小儿髋关节摄影的论述,错误的是
某框架结构仓库,地上共6层,地下共1层,层高3.8m,占地面积4000m2,地上每层建筑面积均为3600m2。仓库各建筑构件均为不燃性构件,其耐火极限见下表。仓库一层储存桶装润滑油;二层储存水泥刨花板;三层至六层储存皮毛制品;地下室储存玻璃制品
甲企业上一期发行的股利价格为3元/股,预计长期的股利增长率为4.8%。预计增发新股的发行价为25元,每股发行费用为1元,则新股的预计成本率为()。
在检查坏账准备科目的相关会计处理及披露情况时,发现s公司存在以下情况。其中正确的是( )。如果被审计单位内部控制健全,注册会计师依赖了内部控制,将重大错报风险评价为低水平,从而实施了相对较少的实质性程序,但由于被审计单位串通舞弊导致有一项影响会计报表
2003年8月《城市生活无着的流浪乞讨人员救助管理办法》开始实施后,以往的强制性收容遣送工作模式已改变为自愿求助模式。但在自愿性原则之下,流浪儿童却由于这样或那样的原因未必自愿前来中心求助,或者来了一段时间就自己溜走了。为解决此问题,需进行的评估工作有(
在歌唱活动中,儿童最易掌握的是音准,最难掌握的是歌词。()
设z=f(x,y)由f(x+y,x-y)=x2-y2-xy确定,求dz.
最新回复
(
0
)