说明：  压缩包里面包含三个程序，分别是Nyquist图和bode图仿真，已知传递函数，求脉冲和阶跃响应，另一个自己研究一下就可以知道的
(Compressed packet which contains three procedures, namely Nyquist diagram and bode diagram simulation, known transfer function, and impulse and step response, and the other to look at their own will be able to know)