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设,若0<a<b,且f(a)=f(b),则ab的取值范围是 ( )
A.(0,2) B.(0,2] C.(0,4] D.(0,4)
设,若0<a<b,且f(a)=f(b),则ab的取值范围是
A.(0,2)
B.(0,2]
C.(0,4]
D.