bug fixes

Chapter1/chapter1.tex

@@ -118,7 +118,7 @@
 %----------------------------------------------
 \begin{figure}[htp]
     \centering
-\includegraphics[scale=0.4]{./Chapter1/Figures/figure-eniac.jpg}
+\includegraphics[scale=0.4]{./Chapter1/Figures/figure-eniac.jpeg}
     \caption{世界上第一台通用电子数字计算机“埃尼阿克”（ENIAC）}
     \label{fig:1-4}
 \end{figure}