問題詳情
19. 如圖，已知O點為圓心，若∠AOB＝100°，∠B＝35°，則 
＝？
(A)100°
(B)90°
(C)80°
(D)70°
參考答案
答案：[無官方正解]
難度：計算中-1
書單：沒有書單，新增
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