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钻凿蛇穴炮孔爆破巨砾的 - 种方法,在工作面下方或在垂直梯段面前方稍微下向钻孔，通常用于除去前次爆破所造成的残底。当用于爆破巨砾时，则在巨砾下部钻一炮孔，孔内装药爆破
expl. snake-holing

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