如图,在平面直角坐标系中,直线y=1/2x+根号5与x轴y轴分别交与A,B两点,将△ABO绕着原点O顺时针旋转得到△A'B'C',并使AO'⊥AB,垂足为点D,直线AB与线段A'B'相交于点C,动点E从原点O出发,以1个单位/秒得
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