Based on the strata behaviors of steep coal seams, the forms of roof breakage and movement were studied.

根据大倾角煤层采场矿压显现特点，对采场顶板岩层的运动、破坏形式进行了研究。

youdao

Based on the strata behaviors of steep coal seams, the forms of roof breakage and movement were studied.

根据大倾角煤层采场矿压显现特点，对采场顶板岩层的运动、破坏形式进行了研究。

youdao