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如图,∠ACB=60°,半径为2的⊙O切BC于点C,若将⊙O在CB上向右滚动,则...
如图,∠ACB=60°,半径为2的⊙O切BC于点C,若将⊙O在CB上向右滚动,则当滚动到⊙O与CA也相切时,圆心O移动的水平距离为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193851289542544/SYS201311011938512895425007_ST/images0.png)
A.2π
B.4π
C.2
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193851289542544/SYS201311011938512895425007_ST/0.png)
D.4
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