说明：  实现M/M/1单窗口无限排队系统的系统仿真，利用事件调度法实现离散事件系统仿真，并统计平均队列长度以及平均等待时间等值，以与理论分析结果进行对比
(Realization of M/M/1 single window unlimited queuing system simulation, using the event scheduling to achieve discrete event system simulation, and statistical average queue length and the average waiting time equivalents, in order to compare the results with the theoretical analysis)