一般来说，平均总成本曲线是什么形状？
In general, what is the shape of the average-total-cost curve?
定义总成本，平均总成本，边际成本。它们之间关系是什么？
Define total cost, average total cost, and marginal cost. How are they related?
平均成本是总成本除以单位数目产生。
The average cost is the total cost divided by the number of units produced.
平均成本是总成本除以单位数目产生。
The average cost is the total cost divided by the number of units produced.
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