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，边上的数字表示活动的持续时间（天），则完成该项目的最少时间为（ ）天。活动BD最多可以晚开始（ ）天而不会影响整个项目的进度。
问题1选项
A.15
B.21
C.22
D.24
问题2选项
A.0
B.2
C.3
D.5
正确答案及解析
正确答案
解析
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