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放顶线
expl. break in declivity break line; break-off line; caving line; rib line; face break
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
expl. caving line
放 顶 线: 2 phrases in 2 subjects
Electronics1
Technology1

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