—What will you shout when you are in danger?
— . [ ]
A. I'm afraid
B. SOS
C. Help
C
某二叉树前序遍历结点的访问顺序是abdgcefh,中序遍历结点的访问顺序是dgbaechf,则后序遍历结点的访问顺序是
A.bdgcefha
B.gdbecfha
C.bdgaechf
D.gdbehfca