第一类信元较第二类信元具有强占优先权，而且对第二类信元实施流量调控。
Two kinds of customers flow into the system with the first kind of customers a preemptive priority over the second kind of the customers.
也就是说，优先级队列中应该只包含一条到达某个第二类顶点的边。
That is, the queue should contain only one edge to each category 2 vertex.
也就是说，优先级队列中应该只包含一条到达某个第二类顶点的边。
That is, the queue should contain only one edge to each category 2 vertex.
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