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当前学科：信息系统项目管理师（高级）
题目：
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你被任命为一个新项目的项目经理，因而必须要准备一个项目计划。为提供该项目的框架，你决定准备一个WBS来显示投入工作的量级和复杂程度。没有现成的WBS模板能帮助你。为准备WBS，你要做的第一步应该是（）。
A
确定每个项目阶段的估计成本和时间
B
确定主要的项目可交付事项
C
确定每个项目阶段的组成部分
D
确定要完成的关键工作
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