• It can be used for reference for the import and remoulding of supporting equipments of deep well mining of narrow and gentle dip vein.

    对我国缓倾斜薄矿脉矿山深井开采支护设备引进改造,将一定参考借鉴作用。

    youdao

  • It can be used for reference for the import and remoulding of supporting equipments of deep well mining of narrow and gentle dip vein.

    对我国缓倾斜薄矿脉矿山深井开采支护设备引进改造,将一定参考借鉴作用。

    youdao

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