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开采煤层顶板环形裂隙圈内走向长钻孔法抽放瓦斯研究
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开采煤层顶板环形裂隙圈内走向长钻孔法抽放瓦斯研究
Study on Coal Seam Roof Gas Drainage from the Strike of Annular Fracture Areas by the Long Drill Method
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