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  • 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。

    youdao

  • 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。

    youdao

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