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假设有 M/M/1 队列,实现了两个优先级。如果存在高优先级或低优先级的客户(即只存在一个优先级的客户)会发生什么?二维马尔可夫链变成“有效的一维马尔可夫链”?它会像 FCFS 纪律一样行事吗?对整个系统和优先级客户的平均等待时间有何影响?