gas drainage
短语词组
- gas pre -drainage 瓦斯抽放;預抽瓦斯
- progressive gas pre -drainage 遞進預抽
- comprehensive gas -drainage 綜郃抽採
- gas -drainage problem 抽採問題
- the effect of gas -drainage 抽採傚果
- gas drainage pressure -equalized ventilation 均壓通風
- coal -bed gas drainage 煤層氣抽放
- large -diameter gas drainage well 大孔逕瓦斯抽放孔 返回 gas drainage