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【单选题】
设定义域为（0，+∞）的单调函数f（x），若对任意的x∈（0，+∞）， f(f(x)+lo g 1 2 x)=6 ，则方程f（x）=2 x 解的个数是（　　）
A.
3
B.
2
C.
1
D.
0
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