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如图,A、B、C是⊙O上的三点,∠BAC=30°,则∠BOC的大小是( ) A....
如图,A、B、C是⊙O上的三点,∠BAC=30°,则∠BOC的大小是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192359357089840/SYS201311011923593570898006_ST/images0.png)
A.30°
B.60°
C.90°
D.45°
考点分析:
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