• The key issue for the structures above the old mined-out area is the residual movement amount of the old mined-out area.

    采空区上方建筑关键因素老采空区的残余移动大小。

    youdao

  • The key issue for the structures above the old mined-out area is the residual movement amount of the old mined-out area.

    采空区上方建筑关键因素老采空区的残余移动大小。

    youdao

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