厚及特厚煤层
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high and extra-high seam mining 厚及特厚煤层开采
high and extra-high seam
高缝和特高缝
以上为机器翻译结果，长、整句建议使用 人工翻译 。
From rock strength, the main seam roof is divided into extra-high intensity, high intensity, middle intensity, and low intensity.
从岩石强度方面把煤层顶板分成强度特高型、强度高型、强度中等和强度低型。
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