• 赋存稳定结构简单煤种为FM、JM,煤层顶板石灰、粉底板泥质粉砂、砂

    The occurrence is steady and the structure is simple with FM, JM types of coal, whose roof is limestone and siltstone and bottom is muddy siltstone and sandy mudstone;

    youdao

  • 赋存稳定结构简单煤种为FM、JM,煤层顶板石灰、粉底板泥质粉砂、砂

    The occurrence is steady and the structure is simple with FM, JM types of coal, whose roof is limestone and siltstone and bottom is muddy siltstone and sandy mudstone;

    youdao

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