large-diameter well recharge 大口井回灌

large-diameter well 大口径井

large diameter well method 大井法

large-diameter well pumping 大口径抽水

large diameter well point dewatering 大口径井点降水

large-diameter sunk well 大口径沉井

large diameter tube well 大口径管井

large diameter water well 中大口径水井

large-diameter vacuum deep well 大口径真空深井