断路器的辅助接点的常态是指断路器在（    ）时辅助接点的通或断的状态。 A.
分闸 B.
合闸 C.
分闸合闸都可以 D.
以上答案都不是

单项选择题互感器最主要的作用是()

单项选择题As long as we find the right social network platform, we don't need to rely on the traditional spreading network marketing, and can reach the target consumers more accurately.（ ）