在保护柜端子排上(外回路断开),用1000伏摇表测量保护各回路对地的绝缘电阻值应()。
A、大于10MΩ
B、大于5MΩ
C、大于0.5MΩ
D、大于2MΩ
参考答案:A
– Can a plane fly _______ the Atlantic Ocean?
--Yes, but it needs to go _______ the clouds for hours.
A.across, through
B.through, across
C.across, across
D.through, through
氧气瓶储存处周围8m内,禁止堆放易燃易爆物品和动用明火。()