20.R=Pa/Pb说明某一时点上的汇率决定，这是-湖北继续教育网网校

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[单选题]20.R=Pa/Pb说明某一时点上的汇率决定，这是

AA．绝对购买力平价

B相对购买力平价

C利率平价

D货币平价

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