ventilation shaft
短語詞組
- piston ventilation shaft layout 活塞風(fēng)井設(shè)置
- ventilation of mine shaft 礦井通風(fēng)
- south ventilation shaft 南風(fēng)井
- surface mine ventilation shaft 地面風(fēng)井
- uranium mine ventilation shaft 鈾礦井通風(fēng)
- emergency ventilation shaft 事故通風(fēng)井
- a ventilation shaft 排氣孔
- tunnel l ventilation shaft 隧道通風(fēng)井
- ventilation shaft reconstructing 風(fēng)井改造 返回 ventilation shaft