如图3—7所示的PERT图中，事件6的最晚开始时刻是( )。
- A.0
- B.3
- C.10
- D.11
正确答案及解析
正确答案
解析
计算如下：先计算每个任务的最早时间： 2号开始的最早时间是0+2=2，5号是2+2=4，7号是4+5=9，3号是0+2=2，4号是0，6的两个前驱任务3，4中取最迟的，则是4，8号的两个前驱任务是5和6，取最迟的是9，9的两个前驱是7，8，去最迟的时间是15．接下来计算最迟开始时间，9号任务的最迟时间是15，就是最早开工时间，因为9是最后一个任务了。倒过来计算7的最迟时间是15—6=9，8号的最迟是15-4=11，8号的前驱是6，因此6的最迟时间是11一1=10，其余依次类推即可。
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