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如图,将半径为2cm的圆形纸片折叠后,圆弧恰好经过圆心O,则折痕AB的长为( )...
如图,将半径为2cm的圆形纸片折叠后,圆弧恰好经过圆心O,则折痕AB的长为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193417368385833/SYS201311011934173683858010_ST/images0.png)
A.2cm
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193417368385833/SYS201311011934173683858010_ST/0.png)
cm
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193417368385833/SYS201311011934173683858010_ST/1.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193417368385833/SYS201311011934173683858010_ST/2.png)
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