多选题:关于单价合同,下列说法正确的是(  )。

题目内容:
关于单价合同,下列说法正确的是(  )。 A.由于单价合同允许随工程量变化而调整工程总价,业主和承包商都不存在工程量方面的风险,因此对合同双方都公平
B.采用单价合同,在招标前发包单位无需对工程范围做出完整的、详尽的规定
C.采用单价合同,业主的实际投资容易超过计划投资。
D.采用单价合同,投标人只需对所列工程内容报出自己的单价,从而缩短投标时间
E.单价合同条件下,无论发生哪些影响价格的因素都不对单价进行调整大
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