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optimal delay time in controlled contour blasting
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控制边界爆破中最佳延时时间
从地面振动或大半管系数〈high half cast〉因素来讲,最经济的延时时间。最大的半管系数可以通过瞬时点火达到最小的地面振动可以通过几乎连续的点火实现
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