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圆心距为2的两圆相切,其中一个圆的半径为1,则另一个圆的半径为( ) A.1 B...
圆心距为2的两圆相切,其中一个圆的半径为1,则另一个圆的半径为( )
A.1
B.3
C.1或2
D.1或3
考点分析:
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