单双循环公式的推导过程

简介：Because the craftsmen of the firearms factory have rich experience in making tens of thousands of enemies, the research and development of hand grenades has a certain technical foundation. To put it bluntly, the grenade is a scaled-down version of the ten thousand enemies. The mud cover is replaced by iron cover. The difficulty is how to ensure that the fuze is in place. It will not go out during throwing.