20kV线路一般可配置的保护有()
A.光纤差动保护
B.过电流保护
C.零序电流保护
D.距离保护
参考答案:B, C
Can you tell me ________ tomorrow?[ ]
A. where they will fly to
B. what will he do
C. when he arrived
D. how did he go there
低压验电笔主要用于检查对地电压1000V及以下的电气设备和线路是否带电。