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## 编译环境
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## 我的问题
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\bibliographystyle{elsarticle-num-names}
\vspace*{0.5cm}
\begin{thebibliography}{21}
\bibitem[Heilongjaing Province People's Govornment(2020)]{Heilongjaing Province People's Govornment2020}
CCTV news 1+1: focuses on Suifenhe. China: Heilongjaing Province People's Govornment,2020. Available from:http://www.hlj.gov.cn/zwfb/system/2020/04/14/010923836.shtml[cited Apr 14]
\end{thebibliography}
\end{document}
\endinput
正文中引入格式是 \cite{Heilongjaing Province People's Govornment(2020)}
出现的结果是[?]
