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\documentclass{article}
\begin{document}
\begin{table}
\caption{Symbol Table}
\centering
\begin{tabular}{lll}
\hline
Symbol & Definition & Unitis\\
\noalign{\global\arrayrulewidth1pt}\hline\noalign{\global\arrayrulewidth0.4pt}
\multicolumn{3}{c}{\textbf{Constants}}\\
$\lambda$ & Mean of Poisson distribution & unitless\\
$p_{slow}$ & Probability that a vehicle slows down randomly & unitless\\
\hline
\end{tabular}
\end{table}
\end{document}
追问
谢谢了!请问你知道表格定宽是怎么做到的么?
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