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firmness of rock
expl.
岩石坚固性
指在采矿工程中岩石难于或易于破碎或维护的性质。人们在采矿实践中认识到有的岩石容易破碎,有的则难, 有的易于维护, 有的则容易冒落,于是产生岩石坚固性的概念
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