14.已知函数f(x)的定义域是[4,5],则函数f(x2+3)的定义域是( )
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| A. | [1,$\sqrt{2}$] | B. | [-$\sqrt{2}$,-1]∪[1,$\sqrt{2}$] | C. | [$\sqrt{2}$,+∞) | D. | (-∞,-$\sqrt{2}$)∪[$\sqrt{2}$,+∞) |