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如图,A、B、C、D分别是⊙O上的四点,∠AOC=80°,则∠ADC和∠ABC等...
如图,A、B、C、D分别是⊙O上的四点,∠AOC=80°,则∠ADC和∠ABC等于( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161600200547056/SYS201310221616002005470005_ST/images0.png)
A.40°和140°
B.40°和110°
C.50°和140°
D.50°和110°
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