【单选题】【消耗次数：1】
若企业生产处于规模经济常数阶段，长期平均成本曲线切于短期平均成本曲线的（ ）。
①
右端
②
左端
③
最低点
④
无法确定
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【多选题】
长期平均成本曲线与短期平均成本曲线的关系是
①
A、长期平均成本曲线是短期平均成本曲线的包络曲线
②
B、长期平均成本曲线都在各短期平均成本曲线的上方
③
C、长期平均成本曲线的每点都对应着一个短期平均成本曲线上的点
④
D、长期平均成本曲线都在各短期平均成本曲线的下方
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