risern.起床者;起义者;竖板;冒口
riser base冒口窝
riser duct上升喉管
riser wear隔水管磨损
riser pipe立管
riser neck冒口颈
riser tube提升管
riser bush冒口圈
riser board踏步竖板
riser block调整垫板
riser shaft主井