中文说明：理想质点外弹道计算。需要输入的参数包含弹丸初速，质量，发射角，阻力系数。假设前提是空气阻力恒定。希望对相关领域的有所帮助
English Description：
The exterior ballistic calculation of ideal particle. The parameters to be input include muzzle velocity, mass, launching angle and drag coefficient. It is assumed that the air resistance is constant. I hope it will be helpful to the development of related fields