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当前学科：PMP项目管理师
题目：
单选题
项目经理创建了工作分解结构（WBS）和WBS词典。应该使用下列哪一个因素确定工作包详情的层次？（）
A
项目的复杂性
B
WBS机构的格式
C
自上而下法
D
单个的工作组成部分
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