说明：  单服务排队系统的马尔可夫过程源码并附详细解释！可得平均队列长度、平均等待时间、队列长度的变化情况、以及每次变化的详细时间，并附详细图表
(Single-service queuing system with the source of the Markov process explained in detail! Available to the average queue length, average wait time, queue length changes, and changes in detail each time, with detailed charts)