gas pre-drainage 瓦斯抽放 ; 预抽瓦斯
rational pre-drainage period 合理预抽期
pre - drainage time 预抽时间
pre-drainage result 预抽效果
progressive gas pre-drainage 递进预抽
pre-mining drainage 采前预抽
In this study, a new horizontal pre-drainage system is suggested.
在这项研究中，一个新的横向预排水系统被建议。
The field test indicated that the developed drilling rig is appropriate for underground pre-drainage of coal seams.
现场试验表明，这是一种适于井下工作面钻进瓦斯预抽放短钻孔的轻便高效钻机。
An effective pre-drainage system in a limited area that has a high water head and huge inflow is important to prevent flooding accidents during subsea tunnelling.
一个有效的预排水系统在一个有限的区域内，有一个高水头，巨大的流入，重要的是要防止水浸事故发生的海底隧道。
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