• 确保采矿安全减少采场空顶时间采用了“强采方法提出了具体办法。

    It is proposed to decrease exposure time of mining excavation to minimum and fill the excavation quickly using new filling method for security.

    youdao

  • 确保采矿安全减少采场空顶时间采用了“强采方法提出了具体办法。

    It is proposed to decrease exposure time of mining excavation to minimum and fill the excavation quickly using new filling method for security.

    youdao

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