【单选题】低压电网中的TN-C-S系统,整个系统内()
【单选题】低压电网中的TN-C-S系统,整个系统内()
【单选题】低压电网中的 TN-C-S 系统,整个系统内()
【多选题】低压配电网中的TN系统又分为TN-C、TN-S、TN-C-S三种形式,以下正确的表述是:( )
A.
TN-C系统整个系统内中性线(零线)N和保护线PE是合用的
B.
TN-S系统整个系统内中性线(零线)N与保护线PE是分开的
C.
TN-S系统整个系统内中性线(零线)N与保护线PE是合用的
D.
TN-C-S系统整个系统内中性线(零线)N与保护线PE是部分合用的
【简答题】My ____ guest will be a movie actor.
【单选题】听力原文:Interviewer: My guest today is Douglas Turner, who recently spent a weekend climbing a mountain in Africa. Douglas, how did this come about? Douglas: Well, I suppose it started with seeing advert...
A.
sure that he would enjoy training for it
B.
uncertain if it was a good idea for him
C.
surprised that such activities were organised
【单选题】低压电网中的TN-C-S系统,整个系统内()
【判断题】核磁共振波谱法与红外吸收光谱法一样,都是基于吸收电磁辐射的分析法。( )
【单选题】低压电网中的TN-C-S系统,整个系统内()