短語詞組短語gas source concentration region 氣源集聚位置gas drainage concentration 抽放濃度gas emission concentration 瓦斯涌出濃度gas phase concentration respectively 氣相濃度gas phase concentration 氣相濃度gas source concentration 氣源集聚curve of off -gas CO concentration 爐氣CO濃度曲線gas concentration gradient 氣體濃度梯度Greenhouse Gas Concentration 溫室氣體濃度 返回 gas concentration