[化] 初速; 初速度

initial velocity的用法和样例：

例句

The initial speed of a free falling body is zero, but it will grow faster and faster.自由落体的初速为零，但越来越快。
This paper analyses the effective factors and restricted methods of combustible cartridge case charge on muzzle velocity probable error.分析了可燃药筒对初速或然误差的影响因素及限制办法。

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