A.相電壓 B.線電壓
A.大于8Ω B.等于8Ω C.小于8Ω
A.從發(fā)生故障到保護(hù)出口動(dòng)作時(shí)間B.從發(fā)生故障到斷路器開(kāi)始跳閘的時(shí)間C.從發(fā)生故障到斷路器跳閘滅弧為止的時(shí)間