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【单选题】
在短期中，随着产量的增加，平均固定成本（ ）。
A.
一直趋于增加
B.
先增加后减少
C.
一直趋于减少
D.
先减少后增加
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相关题目：
【多选题】电控空气悬架区别于普通悬架,在于增加随时调节哪些功能
A.
连接车轮与车身
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decisions made on all empty stomach may be unreasonable．
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A.
Andrew Carnegie was successful in his bold investments.
B.
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C.
Andrew Carnegie became wealthy by merging his companies.
D.
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