说明：  考虑一个排队系统，顾客到达后，若无空闲服务台则等待，否则接受服务后离开，仿真目的是统计服务台前的平均队长和服务台的忙闲程度。要求能利用离散事件系统仿真的方法对该系统进行仿真，系统的规则和参数自定。
(Consider a queuing system, customers arrive, if not idle while waiting for help desk, or to accept service leave, simulation aim is to stage the average statistical services and help desk captain Busy extent. Requested to make use of discrete event system simulation approach the system simulation, system rules and parameters of self.)