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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
expl. firmness of rock
岩石坚固性
: 4 phrases in 2 subjects
Engineering geology1
Technology3

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