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【简答题】
若不同两点P，Q的坐标分别为(a，b)，(3-b，3-a)，则线段PQ的垂直平分线l的斜率为（    ）；圆（x-2） 2 +（y-3） 2 =1关于直线l对称的圆的方程为（    ）。
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