The necessary and sufficient conditions are given for the schedulability of real time connections at each network node under preemptive earliest due date scheduling policy.
在抢先最早预定日期调度策略下，给出了任意网络结点上实时连接调度能力的充分必要条件。
This method only needs computing the earliest start -time and the lastest finish-time of the node. Thus you work it out.
该方法只需计算出结点最早开始时间和最迟结束时间，便可确定出网络图的关键线路。
This method only needs computing the earliest start -time and the lastest finish-time of the node. Thus you work it out.
该方法只需计算出结点最早开始时间和最迟结束时间，便可确定出网络图的关键线路。
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