steeply pitching thick coal seam
steeply pitching thick coal seam
大倾角厚煤层
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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The specific calculated data of mining technology in the steeply pitching medium thick coal seam and it's application effect in real construction are introduced.
介绍了急倾斜中厚煤层回采工艺的具体计算数据，以及在实际施工中的应用效果；同时介绍了采后沿空留巷的施工方法。
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