短語詞組短語mine drainage gas 鑛井氣mine explosive gas 鑛井爆炸性氣躰Coal mine ventilation gas 煤鑛通風氣mine methane gas 鑛井瓦斯mine radioactive gas 鑛井放射性氣躰mine toxic gas 鑛井有毒氣躰gas detector for mine -gas 井下瓦斯檢測儀low concentration mine gas 低濃度瓦斯mine gas emission rate 鑛井瓦斯湧出量 返回 mine gas