A.當(dāng)機(jī)組或引水道發(fā)生事故時(shí)緊急關(guān)閉,以防事故擴(kuò)大B.當(dāng)檢修事故閘門及其門槽時(shí)用以堵水C.當(dāng)機(jī)組活動(dòng)導(dǎo)葉漏水時(shí)用以關(guān)閉D.當(dāng)機(jī)組做調(diào)相運(yùn)行時(shí)用以關(guān)閉
A.潛沒(méi)式進(jìn)水口B.開(kāi)敞式進(jìn)水口C.虹吸式進(jìn)水口D.深入式進(jìn)水口