单项选择题
A.20% B.大于20% C.小于20% D.0
A.故障—延时—跳闸—合闸—跳闸 B.故障—跳闸—延时—合闸—跳闸 C.故障—跳闸—合闸—延时—跳闸 D.故障—跳闸—合闸—跳闸
A.3429.6 B.4648.6 C.4812.3 D.5940