低压配电系统的接地型式共有TT系统,TN系统两种。
参考答案:错
— What's the police station's telephone number?
— I can't remember. Look _____ in the telephone book, please.[ ]
A. it for
B. it over
C. it up
D. at it
职业道德品质的养成,不是一蹴而就的,要自觉从小事做起,从()做起。