顶分层开采
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the top slice mining 顶分层开采
mining top slice
采矿顶板
以上为机器翻译结果，长、整句建议使用 人工翻译 。
During mechanical longwall top coal mining, the gas permeability in top coal ahead of working face has bigger difference compared with slice mining due to the increase of mining height.
综放开采由于采高的加大，导致采场前方顶煤中瓦斯渗透性与分层开采有较大的差异。
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