某网络工程计划图26-2如下所示，边上的标记为任务编码及其需要的完成时间（天），则整个工程的工期为（ ）。
- A.21
- B.22
- C.25
- D.29
正确答案及解析
正确答案
解析
关键路径法（CriticalPathMethod，CPM），在一个项目中，只有项目网络中最长的或耗时最多的活动完成之后，项目才能结束，这条最长的活动路线就叫关键路径，组成关键路径的活动称为关键活动。整个项目工期是由最长的线路来决定的。寻找最长路径1→2→3→4→5→6，路径之和就是整个工程的工期。
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