Latex "Error: Extra alignment tab has been changed to \cr. "
Latex 编译时出现 Error: Extra alignment tab has been changed to \cr. 是因为\begin{tabular}后面的参数指定为7列，而实际排了8列数据。
文章来自：http://www.cnblogs.com/zhangzujin/p/7845694.html
Latex 编译时出现 Error: Extra alignment tab has been changed to \cr. 是因为\begin{tabular}后面的参数指定为7列，而实际排了8列数据。