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，连接顶点的边表示活动，边上的数字表示该活动所需的天数，则完成该项目的最少时间为______天。活动BD最多可以晚（请作答此空）天开始而不会影响整个项目的进度。
- A.2
- B.3
- C.5
- D.9
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。根据上图计算出关键路径为A-B-C-E-F-I-K-L，其长度为24，关键路径上的活动均为关键活动。活动BD不在关键路径上，包含该活动的最长路径为A-B-D-G-I-K-L，其长度为22，因此松弛时间为2。
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