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【单选题】
If firms set prices and then keep them fixed for a period of time, their fixed prices imply thatA.
the aggregate price level is fixed and that aggregate demand determines the quantity of goods and services sold.
B.
prices are set by aggregate demand and supply.
C.
the aggregate price level adjusts continuously.
D.
the aggregate price level is fixed and that aggregate supply determines the quantity of goods and services sold.
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A.
单击“开始”功能区的“字体” 组
B.
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A.
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A.
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C.
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D.
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A.
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B.
单击“开始”功能区的“对齐方式”
C.
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D.
单击“开始”功能区的“编辑”
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