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\begin{figure} [htb!]
\centering
\includegraphics[width=20]{相对路径}
\caption{标题}
\label{fig:my-fig}
\end{figure}

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\begin{table}
\centering
\caption{}
\label{tab:my-tab}
\begin{tabular}[|c|]
\hline
1&2
\\\hline
3&4
\\hline
\end{tabular}
\end{table}

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\usepackage{calc}
\usepackage{geometry}
\geometry{a4paper,textwidth=\widthof{一}*\real{35}}

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\setcounter{tocdepth}{2}