急倾斜特厚煤层水平分段开采综放面抽采钻孔合理布孔层位的研究
급경사특후매층수평분단개채종방면추채찬공합리포공층위적연구
Research on Rational Position of Methane Drainage Boreholes in Full-mechanized Cawng Mining Steeply-inclined Extremely-thick Coal-seam by Horizontal Sublevel Method
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