弹丸

These shotty nodes are usually firm, not fixed, and are less than a centimeter in diameter.

这些似样结节通常坚硬，不固定，直径小于1厘米。

In this paper , pill-setover control system which used for incept and disposal of signal of space movement is devised and explored in detail.

本文对制系统空间运动信号的接收与处理进行了全面的设计与探索。

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.

在前体外形外界大气密度不变的条件下，提出了利用炮口马赫数顶点马赫数确定旋最佳尾锥的方法。