若一棵具有n(n >0)个结点的二叉树的先序序列与后序序列正好相反,则该二叉树一定是
A.结点均无左孩子的二叉树
B.结点均无右孩子的二叉树
C.存在度为2的结点的二叉树
D.高度为n的二叉树
正确答案是D
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