placid outflow gas

同义词释义

1)placid out-flow gas,瓦斯平稳泄出2)placid out-flow methane,瓦斯平稳泄出3)methane,瓦斯4)coal gas,瓦斯5)mine gas,瓦斯6)gas,瓦斯7)methane gas,瓦斯8)gas concentration,瓦斯浓度9)gas control,瓦斯治理10)gas drainage,瓦斯抽放