... vertical clearance 竖向净空 vertical cleat 垂直割理 vertical cliff 垂直崖壁 ...
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This experiment bases on different permeability in different directions of coal seam cleats. To arrange methane drainage direction the directions vertical and parallel to face cleat are adopted.
根据煤层割理渗透率的各向异性，采用垂直面割理和平行面割理两个方向布置钻孔抽放煤层气。
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