单选题:确定工程项目投资建设的必要性和可行性,即“立项”的先决条件的是(  )。

题目内容:
确定工程项目投资建设的必要性和可行性,即“立项”的先决条件的是(  )。 A.场地
B.资金
C.宏观条件约束
D.条件的研究

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