某软件项目的活动图如下图所示,其中顶点表示项目里程碑,连接顶点的边表示包含的活动,边上的数字表示相应活动的持续时间(天),则完成该项目的最少时间为()天。活动BC和BF最多可以晚开始(请作答此空)天而不会影响整个项目的进度

- A.0 和 7
- B.0 和 11
- C.2 和 7
- D.2 和 11
正确答案及解析
正确答案
解析
本题考查软件项目管理的基础知识。请学员看清楚题号,不要说没答案。活动图是描述一个项目中各个工作任务相互依赖关系的一种模型,项目的很多重要特性可以通过分析活动图得到,如估算项目完成时间,计算关键路径和关键活动等。根据上图计算出关键路径为A-B-C-E-F-J和A-B-D-G-F-J,其长度为18。关键路径上的活动均为关键活动。活动BC在关键路径上,因此松弛时间为0。活动BF不在关键路径上,包含该活动的最长路径为A-B-F-J,其长度为11,因此该活动的松弛时间为18-11=7。
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