effective perforation
... 有效平均压力：EMP 有效炮眼：effective perforation 有效排量：effective displacement ...
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传统的隧道深孔爆破采用纯炮泥堵塞炮眼，炸药的有效能量利用率不高，炸药单耗量大。
The traditional deep-hole blasting for tunnels USES pure clay to stem the blast-holes. The efficient energy availability of explosive is not high and the specific explosive consumption is large.
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