封抽
封抽-
瓦斯抽采是瓦斯治理的重要手段，瓦斯抽采主要依靠打钻和封孔来完成，而封孔是瓦斯抽采的重要环节，其中封孔深度对于瓦斯抽采具有重要影响。
Gas drainage is an important means of gas treatment , gas drainage rely mainly on drilling and sealing , while the sealing is an important part of the gas drainage , in which the depth of sealing for the gas drainage has a significant influence .