In this paper, grey sequence forecast model PGM(1, 1) was built by using Excel which consisted of matrix operation and function of programming, so that the forecast precision was improved.是什么意思_In this paper, grey sequence forecast model PGM(1, 1) was built by using Excel which consisted of matrix operation and function of programming, so that the forecast precision was improved.在线翻译_英语_读音_用法_例句