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若一个项目由9个主要任务构成,其计划图(如下图所示)展示了任务之间的前后关系以及每个任务所需天数,该项目的关键路径是(6),完成项目所需的最短时间是(7)天。

A.A→B→C→D→I

B.A→B→C→E→I

C.A→B→C→F→G→I

D.A→B→C→F→H→I

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