... pitching machine 自动投球机 ; 自动投球器 ; 发球机 pitching seam 倾斜层 synchronous pitching 同步纵摇 ...
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greater pitching seam 大倾角煤层
pitching thick seam 倾斜厚煤层
steeply pitching thick coal seam 急倾斜厚煤层
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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