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【单选题】
投入某种物质商品生产过程中的活劳动量不变,如果整个部门劳动生产率提高,在单位劳动时间内生产的商品数量和单个商品价值量之间,两者的变化表现为( )
A.
商品数量增加，价值量不变
B.
商品数量不变
C.
商品数量增加，价值量减少
D.
商品数量增加，价值量增大
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