某炮弹质量为20KG，直径120mm，出炮口是的初速为800m/s，初始发射角等于45°，试计算弹道。解答过程与程序详解-A shell quality is 20 kg, 120 mm in diameter, out of the muzzle velocity of 800 m/s, initial emission Angle is 45 °, try ballistic calculation. The solution process and procedure, rounding