本发明提升力大，可实现强力提拔，便于处理孔内事故。
The invention has the advantage of large lifting power, so that powerful lift can be realized, and accidents in holes can be conveniently dealt with.
本发明提升力大，可实现强力提拔，便于处理孔内事故。
The invention has the advantage of large lifting power, so that powerful lift can be realized, and accidents in holes can be conveniently dealt with.
应用推荐