A.故障前10s到故障后60s B.故障前后30s C.故障前20s到故障后60s D.故障前后60s
A.分段式相間保護(hù) B.低周切機(jī) C.高周切機(jī) D.距離保護(hù)
A.0.05 B.0.08 C.0.1 D.0.12