某工程计划图(如图6-2所示)，弧上的标记为作业编码及其需要的完成时间(天)，作业F最迟开始时间需在第()天开始。
- A.8
- B.12
- C.13
- D.17
正确答案及解析
正确答案
解析
“工程计划图”又称为工程网络图，与Gantt图(因果分析图，又称鱼骨刺图)是两种常用的项目管理工具，用于工作计划安排的评审和检查。本试题中该工程计划图的关键路径是A→B→D→F→G，该路径所花费的时间最长(20天)。由于作业F是关键路径中的一个作业，因此作业F的松驰时间为0。由于松驰时间＝最迟开始时间-最早开始时间，而该工程计划图中作业F的完成依赖于作业C、D的完成，虽然作业B、C可并行进行，但作业A、B、D需花费12天时间，作业F最早可在第13天开始。因此作业F最迟开始时间是第13天。
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