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爆速升降带
爆速梯度沿其炮孔长度而变〈上升或下降〉。产生升降带的一个原因可能是炸药的爆速不同于起爆药的爆速。在大型炮孔中,爆速可能由于起爆药至冲击波达到炮孔壁之间的距离而下降,然后稳定、再提速
expl.
run-up or down zone
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