A.起、下鉆時(shí)間短,循環(huán)間斷,不能旋轉(zhuǎn) B.起、下鉆時(shí)間長,循環(huán)間斷,不能旋轉(zhuǎn) C.起、下鉆時(shí)間短,循環(huán)不間斷,不能旋轉(zhuǎn) D.起、下時(shí)間短,循環(huán)間斷,可以旋轉(zhuǎn)
A.撓性塑管 B.撓性鋼管 C.普通小徑鉆桿 D.剛性電纜
A.電纜起下,液體壓擋,地面點(diǎn)燃 B.鋼絲繩起下,水泥塞封堵,地面點(diǎn)燃 C.油管輸送,封隔器壓擋,地面點(diǎn)燃 D.鋼絲繩起下,液體壓擋,地下點(diǎn)燃