如圖,點A、B、C在⊙O上,∠ABC=60°,則∠A0C的度數爲( )A.30° ... 問題詳情:如圖,點A、B、C在⊙O上,∠ABC=60°,則∠A0C的度數爲( )A.30° B.60° C.100° ...