The mining deformation damage law of thick sandy soil over roof is the basis of setting up the dynamic structure theory of roof.
顶板厚砂土层采动变形破坏规律是建立顶板动态结构理论的基础。
The mining deformation damage law of thick sandy soil over roof is the basis of setting up the dynamic structure theory of roof.
顶板厚砂土层采动变形破坏规律是建立顶板动态结构理论的基础。
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