如图，△ABC的顶点A、B、C、均在⊙O上，若∠ABC∠AO

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更新 2022-09-03
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如图，△ABC的顶点A、B、C、均在⊙O上，若∠ABC+∠AOC=90°，则∠AOC的大小是（）

A.30° B.45° C.60° D.70°

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