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在平面直角坐标系中,以点(3,-5)为圆心,r为半径的圆上有且仅有两点到x轴所在...
在平面直角坐标系中,以点(3,-5)为圆心,r为半径的圆上有且仅有两点到x轴所在直线的距离等于1,则圆的半径r的取值范围是( )
A.r>4
B.0<r<6
C.4≤r<6
D.4<r<6
考点分析:
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