ventilation shaft

短语词组

短语

• piston ventilation shaft layout 活塞风井设置
• ventilation of mine shaft 矿井通风
• south ventilation shaft 南风井
• surface mine ventilation shaft 地面风井
• uranium mine ventilation shaft 铀矿井通风
• emergency ventilation shaft 事故通风井
• a ventilation shaft 排气孔
• tunnel l ventilation shaft 隧道通风井
• ventilation shaft reconstructing 风井改造
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