• The colliery, as one kind of the mine, is a kind of special geographical area, which is in large scale, wide area, big difference between geological condition and coal seam composition.

    煤矿作为矿山特殊地理区域规模庞大面积较广地质条件煤层赋存条件差别很大

    youdao

  • The colliery, as one kind of the mine, is a kind of special geographical area, which is in large scale, wide area, big difference between geological condition and coal seam composition.

    煤矿作为矿山特殊地理区域规模庞大面积较广地质条件煤层赋存条件差别很大

    youdao

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