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爆破的外部作用在最小抵抗线的方向上，岩石与另一种介质〈空气或水〉相接触，当最小抵抗线小于临界抵抗线时,炸药爆炸后除发生内部作用外，自由面附近也发生破坏。这种引起自由面附近岩石破坏的作用称为爆破的外部作用
expl. blasting action in rock near the free face

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