如图,点C、D是以线段AB为公共弦的两条圆弧的中点,AB=4,点E、F分别是

如图,CD是以线段AB为公共弦的两条圆弧的中点,AB=4,EF分别是线段CD,AB上的动点,AF=xAE2FE2=y,则能表示yx的函数关系的图象是(      

答案

C

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