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、It is the first completely automatic railway in the world. B、The workers on the underground platforms are replaced by machines
A、It is the first completely automatic railway in the world. B、The workers on the underground platforms are replaced by machines
admin
2009-09-12
36
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, to check and to collect them when people leave the trains. This is all different of 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 send 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、It is the first completely automatic railway in the world.
B、The workers on the underground platforms are replaced by machines.
C、Its trains are computer-controlled.
D、Its trains run at a high speed.
答案
A
解析
What is the most special about the Victoria Line?
由选项中railroad,platform,train推测本题与列车和车站有关。本题关键句为“The world’s first complete
automatic railway has been built under the busy streets of London.”可知它是第一条完全自动化的铁路,所以正确答案为A)。
转载请注明原文地址:https://kaotiyun.com/show/Ri37777K
0
大学英语四级
相关试题推荐
A、Sociablepeoplewereimmunetoalldistractions.B、Shyquietpeopleweremostadverselyimpacted.C、Lessoutgoingpeoplewere
A、Theyprioritizeromanceoverfriendship.B、Theytrytostrengthensame-sexfriendships.C、Theybegintotakefriendshipmores
A、Informchildrenofthefamily’sfinancialsituation.B、Shiftchildren’sattentiontointerestingactivities.C、Involvechildre
A、Theyareunsatisfiedwiththeiremployers.B、Theunemploymentratesremainhigh.C、Therearemorebusinessopportunities.D、Th
A、Hehaspresentedhisspeechmanytimes.B、Thetopicisquitefamiliartohim.C、Heknowshowtocomposeaspeech.D、Hisclassm
A、Comprehensiveschooltendstoneglectsomestudents.B、Morechildrenwouldliketogotoagrammarschool.C、Childrenmaynot
Moreandmoreoftheworld’spopulationarelivingintownsorcities.Thespeedatwhichcitiesaregrowinginthelessdevelop
Whentheauthorsaysthecreativemindandthecriticalmind“cannotworkinparallel”(Line4,Para.1)inthewritingprocess,
A、Shewillgivehimsomethingtowrite.B、Shedoesn’tknowwhotookawayhisnotebook.C、Shewantstoborrowsomepaperforhim.
InFranceaboutseventy-fiveyearsago,adesperatewomanbroughtheryoungsonintothelaboratoryofLouisPasteur.Theboyha
随机试题
下列著名医家中被称为“寒凉派”的代表是
患者低热,头晕眼花,心悸不宁,面白少华,唇甲淡白,舌质淡,脉细。宜选方
患儿,男,8岁。上前牙外伤折断1小时。局部检查:冠斜折,切角缺损,牙髓暴露,触痛明显,松动(-)。哪项检查对确定患牙治疗方案最有帮助
患者,男,28岁。上呼吸道感染后2周,出现肉眼血尿、颜面水肿入院。体检:血压20/13.5kPa(150/100mmHg),尿蛋白(+),尿红细胞满视野,血肌酐180μmol/L。患者此时应考虑的最可能诊断是
宏观经济状况包括()方面。
“强力集团”是在19世纪60年代俄国社会运动高涨的条件下出现的一个社会文化力量。请论述“强力集团”的创作主张。
某镇发生禽流感,需要捕杀活鸡,农户不同意,情绪比较激动。你怎么办?
(Ⅰ)设A,B为n阶可相似对角化矩阵,且有相同特征值,证明:矩阵A,B相似.(Ⅱ)设A=,求可逆矩阵P,使得P-1AP=B.
Whydoesthewomanadvisethemanthesublet?
Whatispopculture?Well,popis【C1】______forpopular.Thebeginningofpopculturecanoftenberelatedtopopularmovies,tel
最新回复
(
0
)