A.合閘時(shí)先接通,分閘時(shí)先斷開(kāi) B.合閘時(shí)先接通,分閘時(shí)后斷開(kāi) C.合閘時(shí)后接通,分閘時(shí)先斷開(kāi)
A.應(yīng)立即 B.不允許 C.過(guò)一段時(shí)間
A.困難 B.容易 C.一樣