由于金属矿层状顶板分布较少，故硬岩层状顶板的支护研究也相对较少且处于起步阶段。
Owing to the less common distribution of layered roof in metal mines, the research of the support of hard rock layered roof is relatively less and still at the initial stage.
由于金属矿层状顶板分布较少，故硬岩层状顶板的支护研究也相对较少且处于起步阶段。
Owing to the less common distribution of layered roof in metal mines, the research of the support of hard rock layered roof is relatively less and still at the initial stage.
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