经过（x-1)²+(y+2)²=25的圆心，且与向量$\overrightarrow{a}=(-3,4)$垂直的直线的方程              (   )                                                  

                                                                                                           泊秦淮
                                                                                                            杜牧
                                                                                   烟笼寒水月笼沙，夜泊秦淮近酒家。
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