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如图,⊙O是△ABC的外接圆,已知∠B=60°,则∠CAO的度数是( ) A.1...
如图,⊙O是△ABC的外接圆,已知∠B=60°,则∠CAO的度数是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101707493945584/SYS201311031017074939455011_ST/images0.png)
A.15°
B.30°
C.45°
D.60°
考点分析:
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