顺层长钻孔
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突出煤层顺层长钻孔的施工由于受到施工技术的限制达不到预定的深度，影响了瓦斯抽放效果。
The drilling operation of long holes along outburst coal seam usually can't reach their preset depth since it is handicapped by drilling techniques, which will thus influence gas drainage effect.
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