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【单选题】
已知函数f（x）=log a x（a＞0，a≠1）的图象如右图示，函数y=g（x）的图象与y=f（x）的图象关于直线y=x对称，则函数y=g（x）的解析式为（　　）
A.
g（x）=2 x
B.
g（x）= ( 1 2 ) x
C.
g（x）= lo g 1 2 x
D.
g（x）=log 2 x
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【单选题】Suppose that a given firm experiences decreasing marginal product of labor with the addition of each worker regardless of the current output level.Refer to Scenario 5-1. Average variable cost will be
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rising at all points.
B.
falling at all points.
C.
U-shaped.
D.
constant.
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