【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。
【判断题】用伏安法测电阻时,如果待测电阻的阻值比电压表内阻小得多,则比较适合用电流表外接法测电阻。
【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】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。