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【简答题】
在平面直角坐标系xOy中，过定点C（0，p）作直线与抛物线x 2 =2py（p＞0）相交于A、B两点。 （1）若点N是点C关于坐标原点O的对称点，求△ANB面积的最小值； （2）是否存在垂直于y轴的直线l，使得l被以AC为直径的圆截得的为？若存在，求出l的方程；若不存在，说明理由。
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相关题目：
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