```tex \documentclass[UTF8]{ctexart} \usepackage{amsmath} \usepackage{graphicx} \usepackage{subfigure} \usepackage{float} \usepackage{abstract} \usepackage{tabularx} \usepackage{array} \usepackage{cite} \usepackage{gbt7714} \begin{document} \title{标题} \author{xxx} \maketitle \clearpage \begin{abstract} 777777 \par\textbf{关键词:1 2 3 } \end{abstract} \clearpage \newpage \tableofcontents \newpage \section{绪论} \subsection{研究背景及意义} 2222\cite{蔡良才2004机场净空区范围确定方法} \section{总结} \addcontentsline{toc}{section}{参考文献} \nocite{*} \bibliography{ref} \end{document} ```