树的层次遍历。 题目：给定一棵用二叉链表表示的二叉树，其中的指针t指向根结点，试写出从根开始，按层次遍历二叉树的算法，同层的结点按从左至右的次序访问。-The level of the tree traversal. Title: given a list with that of the binary tree, in which the indicators point to root node t try to write from the root to start, accordi