单项选择题
A.10 B.30 C.60 D.90
A.60%、30s B.60%、60s C.78%、30s D.78%、60s
A.跳闸 B.跳闸延时时间到后跳闸 C.直接合闸 D.合闸允许
A.失压 B.失流 C.断路 D.断相
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