题目内容
In the contacts system of generator main switch on the distribution board, the contacts used to connect and disconnect the power grid is ( ).
查看答案
搜索结果不匹配？点我反馈
更多问题
For the frame-type automatic air circuit breaker, if we can move the handle but cannot be closed, we should check ( ) first.
The arc extinguishing grid of the automatic air circuit breaker is made of ( ).
Generally speaking, there is a ( ) control between main generator sets and emergency generator sets to prevent them running in parallel.
The temporary emergency power source supply the electrical power to ( ).
微信支付 
支付宝支付