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caving line
desert. 崩落线
expl. 放顶线; 切顶线参见 caving line; 放顶线采用垮落法控制顶板时,采煤工作面有支护的空间与采空区的分界线,通常沿该线架设有加强支撑作用的支架
tech. 冒落线; 坍落线

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