The projectile amounts in the cleaning and cooling cycle of lifetime tests of all kinds of firearms were fixed on the base of the vast and systematic research for actual combats and the statistic analysis of combat examples.

• 经大量而系统的实战研究、战例统计分析，确定既可满足试验要求也可指导实战的各种枪械寿命试验中的擦拭与冷却周期射弹量。