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如图,点A、B、C在⊙O上,AO∥BC,∠OBC=40°,则∠ACB的度数是( ...
如图,点A、B、C在⊙O上,AO∥BC,∠OBC=40°,则∠ACB的度数是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100835090569512/SYS201311031008350905695027_ST/images0.png)
A.10°
B.20°
C.30°
D.40°
考点分析:
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