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已知两圆内切,它们的半径分别为3和6,则这两圆的圆心距d的取值满足( ) A.d...
已知两圆内切,它们的半径分别为3和6,则这两圆的圆心距d的取值满足( )
A.d>9
B.d=9
C.3<d<9
D.d=3
考点分析:
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