ventilation shaft

短语词组

短語

• piston ventilation shaft layout 活塞風井設置
• ventilation of mine shaft 鑛井通風
• south ventilation shaft 南風井
• surface mine ventilation shaft 地麪風井
• uranium mine ventilation shaft 鈾鑛井通風
• emergency ventilation shaft 事故通風井
• a ventilation shaft 排氣孔
• tunnel l ventilation shaft 隧道通風井
• ventilation shaft reconstructing 風井改造
返回 ventilation shaft