选择题:[单选题,16.6分] 长期成本曲线呈U型的主要原因是

题目内容:
[单选题,16.6分] 长期成本曲线呈U型的主要原因是

A.价格提高的结果
B.技术作用的结果
C.产量增加的结果
D.规模经济发挥作用的结果
参考答案:

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