[单选题]A binary tree has n nodes and its height is h. In which a new node is inserted, the maximum number of nodes that have changed in height is:某二叉树有n个节点，高度为h。在其中插入一个新的节点，高度发生改变的节点个数最多为：LTk答案窝(daanwo.com)-大学生作业答案及考资分享平台