latex表头左对齐,居中对齐
\begin{tabularx}{0.7\textwidth}{!{\vrule width \heavyrulewidth} >{\raggedright\arraybackslash}X | >{\raggedright\arraybackslash}X !{\vrule width \heavyrulewidth}}
\raggedright
\begin{tabularx}{0.7\textwidth}{!{\vrule width \heavyrulewidth} >{\raggedright\arraybackslash}X | >{\raggedright\arraybackslash}X !{\vrule width \heavyrulewidth}}
\raggedright