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【单选题】
建设工程项目管理，是指自项目开始至项目完成，通过项目策划和项目控制，实现项目的费用目标、进度目标和质量目标。对此，下列理解中正确的是( )。A.
自项目开始至项目完成的是项目的寿命期
B.
项目策划的主要任务是项目定义
C.
费用目标对业主而言就是成本目标
D.
项目实施期管理的主要任务就是通过管理使项目目标得以实现
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