【判断题】城市轨道交通的信号系统是城市轨道交通系统中最重要的设备之一。其作用是指挥行车,保证安全、高效的列车运行。
【单选题】用一直流电压表和一直流电流表测量一分流器的电阻时,常用两种接线方式:甲分流器与电流表串联后再与电压表并联;乙分流器与电压表并联后再与电流表串联,比较两种接线的测量误差,()。(这就是高中物理里电路中电流表的内接和外接)
【单选题】您在做维修工作时会用到测电笔。请问须多久检查一次测电笔的功能性。
【单选题】____是城市轨道交通信号系统的重要组成部分,它是保证行车安全,防止列车进入前方列车占用区段和防止列车超速运行的信号设备。
【单选题】听力原文:W: I'm tired of driving all the way to work and back every day. If only cars could drive themselves! M: Well, some car manufactures are working on them. I guess you'll soon buy one if you can aff...
A.
Driving to work is really a headache.
B.
The woman will be able to buy an intelligent car.
C.
Cars that drive themselves may be very expensive.
D.
He is working with a car producer on intelligent cars.
【单选题】Look at the trouble I am in! If only I ________ more careful when driving. [ ]
【单选题】城市轨道交通通信系统是保证列车( )的设备。