这个是初中九年级上课用的一些文件代码资料，仅供大家参考，本文件为本人转载，版权非本人所有，未经作者（官方）允许，请勿擅自修改文件内容，版权为清华大学一条龙所有。-This is some of the data file code ninth grade junior high school class, and only for your reference, I have reproduced this file, the copyright of all the non-I, without the author s (official) allow, please do not modify the file contents copyright Tsinghua train All.