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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/20131101194053188693497/SYS201311011940531886934005_ST/images0.png)
A.2π
B.4π
C.2
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101194053188693497/SYS201311011940531886934005_ST/0.png)
D.4
考点分析:
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以下关于
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101194053188693497/SYS201311011940531886934000_ST/0.png)
的说法,错误的是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101194053188693497/SYS201311011940531886934000_ST/1.png)
=±2
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101194053188693497/SYS201311011940531886934000_ST/2.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101194053188693497/SYS201311011940531886934000_ST/3.png)
是无理数
C.2<
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<3
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101194053188693497/SYS201311011940531886934000_ST/5.png)
=2
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