短語詞組短語mine drainage gas 礦井氣mine explosive gas 礦井爆炸性氣體Coal mine ventilation gas 煤礦通風(fēng)氣mine methane gas 礦井瓦斯mine radioactive gas 礦井放射性氣體mine toxic gas 礦井有毒氣體gas detector for mine -gas 井下瓦斯檢測(cè)儀low concentration mine gas 低濃度瓦斯mine gas emission rate 礦井瓦斯涌出量 返回 mine gas