如图5­1­14,A,B,C是⊙O上的三点,已知∠AOC=110°,则∠ABC的度数

如图5­1­14ABC是⊙O上的三点,已知∠AOC110°,则∠ABC的度数是(  )

A50°  B55°  C60°  D70°

    

答案

B 

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