Comprehensive measures are taken to protect the ores and rock close to the main fractured formation in the upper wall.
将上分段矿石顶板进行预支护，靠上盘主断裂层的矿岩运用综合维护措施。
Comprehensive measures are taken to protect the ores and rock close to the main fractured formation in the upper wall.
将上分段矿石顶板进行预支护，靠上盘主断裂层的矿岩运用综合维护措施。
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