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The key issue for the structures above the old mined-out area is the residual movement amount of the old mined-out area.
老采空区上方建筑的关键因素是老采空区的残余移动量大小。
youdao
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The key issue for the structures above the old mined-out area is the residual movement amount of the old mined-out area.
老采空区上方建筑的关键因素是老采空区的残余移动量大小。
youdao