\documentclass[a4paper]{ctexart}
\input{mypreamble}
\renewcommand{\mychapternum}{2}
\renewcommand{\mylabname}{DES使用}
\renewcommand{\mydate}{2024年4月2日}
% \setlength{\textheight}{500em}
% \setlength{\paperheight}{500em}

\begin{document}
\mytitle
\begin{enumerate}
    \myitem{实验目的}{
        \item DES编码实验
        \item 3DES编码实验
        \item DES加解密实验
    }
    \myitem{实验设备}{
        \item 49.52.5.80 上的虚拟机
    }
    \myitem{实验原理}{
        \item DES加密和解密
    }
    \myitemx[itemsep=1em]{实验步骤}{
        \item \includegraphics[width=1\linewidth]{imgs/2024-04-02-10-19-09.png}
        \item \includegraphics[width=1\linewidth]{imgs/2024-04-02-10-31-48.png}
        \includegraphics[width=1\linewidth]{imgs/2024-04-02-10-37-08.png}
        \includegraphics[width=1\linewidth]{imgs/2024-04-02-10-38-14.png}
        \item \includegraphics[width=1\linewidth]{imgs/2024-04-02-10-46-20.png}
        \includegraphics[width=1\linewidth]{imgs/2024-04-02-10-47-50.png}
        \includegraphics[width=1\linewidth]{imgs/2024-04-02-10-49-48.png}
        \includegraphics[width=1\linewidth]{imgs/2024-04-02-10-50-41.png}
    }
    \myitem{实验结果总结}{
        \item 本实验使我充分了解了DES的加密和解密的过程，以及如何在Linux中使用Python和C实现DES、3DES的加密和解密。
    }
\end{enumerate}
\end{document}