采用llink-rlink方式存储二叉排序树，编写能够通过键盘输入建立二叉排序树，并在建立完立即在屏幕显示中序遍历结果的程序。-Using llink-rlink way to store binary sort tree, the preparation can be established through the keyboard input binary sort tree, and in the establishment of the screen immediately displa