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【简答题】
在平面直角坐标系xOy中，已知抛物线y=a（x+1） 2 +c （a>0）与x轴交于A、B两点（点A在点B的左侧），与y轴交于点C，其顶点为M若直线MC的函数表达式为y=kx-3，与x轴的交点为N，且 。 （1）求此抛物线的函数表达式； （2）在此抛物线上是否存在异于点C的点P，使以N、P、C为顶点的三角形是以NC为一条直角边的直角三角形？若存在，求出点P的坐标；若不存在，请说明理由； （3）过点A作x轴的垂线，交直线MC于点Q，若将抛物线沿其对称轴上下平移，使抛物线与线段NQ总有公共点，则抛物线向上最多可平移多少个单位长度？向下最多可平移多少个单位长度？
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