9. 下圖之樹的節點排列出某一順序"0136742589",這順序一般稱之為? 
(A) preorder
(B) inorder
(C) postorder
(D)row-major order
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統計: A(125), B(39), C(13), D(5), E(0) #617567
統計: A(125), B(39), C(13), D(5), E(0) #617567