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 i