It is a key for mine safe production to ensure the stability of overlying rock strata in stope.
确保采场上覆岩层稳定是矿井安全生产得关键。
Rock units are first emplaced either by deposition onto the surface or intrude into the overlying rock.
岩石单位首先由于沉积被储与表面或侵入覆盖的岩层。
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