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【单选题】
函数 f(x)= lnx x ，则（ ）A.
f（x）在（0，10）内是增函数
B.
f（x）在（0，10）内是减函数
C.
f（x）在（0，e）内是增函数，在（e，10）内是减函数
D.
f（x）在（0，e）内是减函数，在（e，10）内是增函数
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