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（ ）天开始而不会影响整个项目的进度。
问题1选项
A.9
B.15
C.22
D.24
问题2选项
A.2
B.3
C.5
D.9
正确答案及解析
正确答案
解析
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