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(2010•湖州模拟)已知⊙O1半径为3cm,⊙O2的半径为7cm,若⊙O1和⊙...
(2010•湖州模拟)已知⊙O1半径为3cm,⊙O2的半径为7cm,若⊙O1和⊙O2的公共点不超过1个,则两圆的圆心距不可能为( )
A.0cm
B.4cm
C.8cm
D.12cm
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