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+% 系统设计
+\section{系统设计}
+\begin{frame}
+\frametitle{系统架构}
+\begin{center}\includegraphics[width=\textwidth,height=0.7\textheight,keepaspectratio]{./pic/system_architecture.png}\end{center}
+\end{frame}
\ No newline at end of file
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