加拿大预测28在线预测官网

简介：The production of springs is a very delicate work. With the current level of Ming technology, it is impossible to produce satisfactory springs. Therefore, if you want to make flintlock guns on a large scale, you must first solve the problem of springs. Only when the elasticity of the spring is good enough and the striking force is strong enough can the ignition rate of the flintlock gun be guaranteed.