beam pumping well游梁式抽油机抽油的井
beam pump well杆泵井;游梁式抽油井
beam well-define紧束射柱
beam well-collimated高准直射柱
beam well-focussed高聚焦射柱
beam double-well pumping-unit游梁式双井抽油机
well beam井式梁
well beam floor井式梁楼盖
framing stair well beam楼梯井框架梁;楼梯井杠架梁