通信网络的混合轮询系统仿真和等待时间解析求解程序。每个站有两类数据，数据的产生与长度都不受限制 ， 1类数据穷尽 2类门限-Polling mixed communication network system simulation and analytic solution of the waiting time process. Each station has two types of data, data generated with the length not to be restri