单项选择题
A. B. C. D.
A.各合闸电流之和,8s B.各合闸电流之和,5s C.断路器最大1台合闸电流,8s D.断路器最大1台合闸电流,5s
A.60%,90% B.60%,100% C.90%,60% D.90%,100%