这是一个M/M/C/∞排队系统，其中顾客按照泊松流输入，服务时间按照负指数分布，有C个服务台的单列多台并列服务系统。在这种系统，顾客到达系统后排成一个队列，然后到空闲的服务台接受服务，而每个服务台的服务时间都服从相同参数的负指数分布，服务完毕后顾客自动离去。(This is a M/M/C/ infinity queueing system, where the customers enter the Poisson flow, the service time is distributed according to the negative exponent, and there are C single row multiple parallel service systems of the service stations. In such a system, customers arrive at the system in the rear row into a queue, then receive service at the idle service desk, while the service time of each service station obeys the negative exponential distribution of the same parameter. After the service is finished, the customer automatically goes away.)