gas drainage
短语词组
- gas pre -drainage 瓦斯抽放;预抽瓦斯
- progressive gas pre -drainage 递进预抽
- comprehensive gas -drainage 综合抽采
- gas -drainage problem 抽采问题
- the effect of gas -drainage 抽采效果
- gas drainage pressure -equalized ventilation 均压通风
- coal -bed gas drainage 煤层气抽放
- large -diameter gas drainage well 大孔径瓦斯抽放孔 返回 gas drainage