问题详情

Traversing a binary tree in preorder is equivalent to(68).
A．Traversing the forest corresponding to the binary tree in root-first order
B．Traversing the forest corresponding to the binary tree in root-last order
C．Traversing the forest corresponding to the binary tree in breadth-first order
D．None of the above请帮忙给出正确答案和分析，谢谢！