题目内容：
在（ ）管理模式下，项目单位主要是通过合同约定与参加管理各方发生关系。
A．分项委托 B．专业机构
C．自行
D．代建
参考答案：
答案解析：
单选题：在（ ）管理模式下，项目单位主要是通过合同约定与参加管理各方发生关系。
- 题目分类：工程咨询概论
- 题目类型：单选题
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B．专业机构
C．自行
D．代建
B．专业机构
C．自行
D．代建
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