题目内容

下列各项中，关于可比产品成本降低额和降低率的表述正确的有（）。

A. 可比产品成本降低额=可比产品按上年计划平均单位成本计算的本年累计总成本-本年累计实际总成本
B. 可比产品成本降低率=可比产品成本降低额÷可比产品按上年计划平均单位成本计算的本年累计总成本×100%
C. 可比产品成本降低额=可比产品按上年实际平均单位成本计算的本年累计总成本-本年累计实际总成本
D. 可比产品成本降低率=可比产品成本降低额÷可比产品按上年实际平均单位成本计算的本年累计总成本×100%

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