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如图,在⊙O中,OA⊥BC,∠AOC=50°,则∠ADB的度数为( ) A.15...
如图,在⊙O中,OA⊥BC,∠AOC=50°,则∠ADB的度数为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101191702368824684/SYS201311011917023688246006_ST/images0.png)
A.15°
B.20°
C.25°
D.50°
考点分析:
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