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炮孔底炮孔底部,梯段底部的水平或上倾炮孔,通常是在采石场或露天矿的边坡、台阶和梯段底部,水平或稍倾斜钻出的炮孔
expl. toe of a hole
炮孔底: 35 phrases in 2 subjects
Explosives and Explosive Ordnance Disposal34
Technology1