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(2009•长沙)如图,矩形ABCD的两条对角线相交于点O,∠AOB=60°,A...
(2009•长沙)如图,矩形ABCD的两条对角线相交于点O,∠AOB=60°,AB=2,则矩形的对角线AC的长是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230527557486328/SYS201310212305275574863007_ST/images0.png)
A.2
B.4
C.2
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230527557486328/SYS201310212305275574863007_ST/0.png)
D.4
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230527557486328/SYS201310212305275574863007_ST/1.png)
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