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【单选题】
有一家蛋糕店，当产量Q=499时，平均成本为3.3元，边际成本为3元，那么下面说法中正确的是（）A.
Q=500 时，平均成本上升
B.
Q=500 时，平均成本下降
C.
Q=500 时，生产的总成本上升
D.
Q=500 时，生产的总成本下降
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【单选题】企业在选定目标市场之后，还要决定怎样占领市场，为自己的产品和品牌确定一个恰当的市场地位，这就需要进行（ ）。
A.
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B.
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C.
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D.
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