問題詳情
38. 如下圖，L//M，N為其截線，且 
分別平分∠DAB、∠CBA， 
，則 
= ？
(A)30
(B)60
(C)90
(D)120。
參考答案
答案：A
難度：計算中-1
書單：沒有書單，新增
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