如图5114，A，B，C是⊙O上的三点，已知∠AOC＝110°，则∠ABC的度数

如图5114，A，B，C是⊙O上的三点，已知∠AOC＝110°，则∠ABC的度数是(　　)

A．50° B．55° C．60° D．70°

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

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如图5114，A，B，C是⊙O上的三点，已知∠AOC＝110°，则∠ABC的度数