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charge with bottom air buffer
expl.
底部空气垫
层装药结构,其特点是空气层在炮孔底岩石表面与药柱下端之间,空气垫层上面是一连续药柱,爆炸时利用底部空气垫层调节爆炸气体压力,延长其作用时间,改善了爆破效果
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