高位钻孔_有道手机词典

1.采用高位钻孔和仰角钻孔抽放瓦斯技术，有效地防止了瓦斯超限。
High position bores and elevation bores methane drainage technique can prevent gas problem successfully.
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2.高位钻孔抽放最主要的影响因素是合理层位选择，其钻孔参数应根据采空区冒落带及裂隙带高度来设计。
The reasonable layer selection is the main influencing factors for gas drainage by high level borehole, the borehole parameters is based on the caving & fracture zone height of gob.
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