保护接零适用于低压中性点直接接地的()或220V三相四线制电网。
A、380V
B、5000V
C、1000V
D、500V
参考答案:A
All the travelling fare, unless specifically stated _________, includes admission charges to the attractions, shows and exhibitions we visit.
A.otherwise
B.likewise
C.therefore
D.still
烹制菜肴时,可根据火力强弱情况将火力分为猛火、冲火、()等。
A.大火
B.旺火
C.慢火
D.文火