\bibliography{report} % bibliography data in report.bib
\bibliographystyle{unsrt} % makes bibtex use spphys.bst
unsrt 表示按照引用的先后顺序进行排序
\bibliography{report} % bibliography data in report.bib
\bibliographystyle{unsrt} % makes bibtex use spphys.bst
unsrt 表示按照引用的先后顺序进行排序