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直接顶
位于煤层或伪顶之上具有一定的稳定性,移架或回柱后能立即自行垮落,或在采空区内短期悬露而随后垮落的岩层
zhíjiēdǐng
expl.
immediate roof
直接 顶:
2 phrases
in 2 subjects
General
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Technology
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