It is unchangeable and permanent.
这是持久变。
It is unchangeable and permanent.
这是持久变。
On condition that the front body shape of the projectile is unchangeable,a formula is obtained for determining the relation between the optimum boattail angle and the supersonic flight region.
在弹丸前体外形和外界大气密度变条件下,提出了利用弹丸炮口马赫数和顶点马赫数确定旋转弹丸最佳尾锥角方法。
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