自2012年7月1日起，居民用电实行阶梯电价，根据不同的用电

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自2012年7月1日起，居民用电实行阶梯电价，根据不同的用电量进行分段计价，超出定量标准的用电量，将适当提高电费价格。“对超额部分实行加价收费”说明(　　)

A．商品价格是商品价值的货币表现

B．商品供求关系决定商品价格

C．企业生产经营是为了满足消费者的需要

D．企业自觉运用价值规律进行生产经营

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