下图中的关键路径历时 （ ） 个时间单位。
- A.14
- B.18
- C.23
- D.25
正确答案及解析
正确答案
解析
图论中给出了关键路径的定义，即源点到汇点的最长路径为关键路径。关键路径的识别与计算： 通过观察法可得出关键路径为1—2—4—5—7—8—10，最长路径的历时为3+3+5+3+3+6=23。
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