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如图,A、B、C、D四个点均在⊙O上,∠AOD=70°,AO∥DC,则∠B的度数为( ) [Failed to download image : http://192.168.0.10:8086/QB...
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如图,A、B、C、D四个点均在⊙O上,∠AOD=70°,AO∥DC,则∠B的度数为( )
[Failed to download image : http://192.168.0.10:8086/QBM/2018/5/2/1936696631435264/1937624996904960/STEM/382cf7969ff544eabaa84ea259d3f93a.png]
A. 55° B. 50° C. 45° D. 40°
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