% 导言区
documentclass{article} %book,report,letter
usepackage{ctex} %中文环境需要
usepackage{graphicx} %插图
graphicspath{{figure/}}
%语法：includegraphics[<选项>]{<文件名>}
usepackage{amsmath} %数学公式宏包
usepackage{pifont}
ewcommanddegree{^circ} %右上角小圆圈
ewcommand{adots}{mathinner{mkern2mu%
aisebox{0.1em}{.}mkern2mu
aisebox{0.4em}{.}%
mkern2mu
aisebox{0.7em}{.}mkern1mu}} %数学矩阵省略号
itle{heiti }
author{kaishu }
date{ oday}