abnormal coal seam thickness
accumulated total coal seam thickness
adding pressure station with the mixed coal gas
allochthonous coal seam
artificial coal seam roof
blast furnace coal gas lavation water
coal and coal gas opening together
coal gas
煤气
煤
煤造气
煤矿瓦斯
煤层瓦斯
煤层气
气化煤气
高炉煤气
煤炭气
煤化工
半水煤气
管道煤气
焦炉煤气
煤衍生气
发生炉煤气
煤成气
煤气发生炉
煤气出口温度
煤型气