挑战习题
1/5单选题
难度:

1.两个半径不等的圆相切,圆心距为6cm,且大圆半径是小圆半径的2倍,那么小圆的半径为(  )
A 3cm
B 4cm
C 2或4cm
D2或6cm
提示1:
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正确答案:RA==
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