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如图,在平面直角坐标系中,⊙P与x轴相切于原点O,平行于y轴的直线交⊙P于M,N...
如图,在平面直角坐标系中,⊙P与x轴相切于原点O,平行于y轴的直线交⊙P于M,N两点.若点M的坐标是(2,-1),则点N的坐标是( )
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A.(2,-4)
B.(2,-4.5)
C.(2,-5)
D.(2,-5.5)
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