A.3~5s B.5~10s C.10~15s D.25~35s
A.線路瞬間故障 B.線路永久故障 C.值班員合閘斷路器,線路有故障,引起斷路器跳閘
A.≥10MΩ B.≥20MΩ C.≥30MΩ D.≥50MΩ