【单选题】【消耗次数：1】
经济技术指标变动对产品成本的影响主要表现在对什么指标的影响？
①
产品总成本
②
产品单位成本
③
产品产量
④
产品总成本和产品产量
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已知某企业2007年产品产量为500万件，产品总成本3000万元，其中，固定成本500万元，则该企业2007年单位产品变动成本为（）。
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