说明：  基于波特图的超前滞后校正 cqzh.m文件为主程序 frlaglead为实现计算的M文件 各参数输入见文件中的注释
(Based on Bode plots of the lead and lag correction cqzh.m paper-based procedures frlaglead calculated M for the realization of each parameter input files, see the Notes document)