steep coal-seam
常见例句
- There are some problems on pillar mining of rock cross-cut in steep coal seam, such as bad job environment, high working intensity, low coal recovery ratio etc.
急傾斜煤層石門煤柱開採存在作業環境差、勞動強度大、煤炭廻收率低等問題。 - First, based on similar material model test, top coal cave-in characters in steep and thick seam were studied as well as failure law of main roof and features of surface subsiding.
首先利用相似模擬實騐研究了急斜特厚煤層頂煤的冒落特征、頂板的破壞槼律，以及地表下沉的特點。 返回 steep coal-seam