答案1
titlesec
包裹是你的朋友。
\documentclass[openany]{book}
\usepackage[explicit]{titlesec}
\newcommand\mychapN{%
\titleformat{\chapter}[display]
{\Huge \bfseries}{}{0pt}
{\parbox[t]{\chapnumb}{%
\chaptername\ \thechapter\ \\[1em] ##1}%
{%
}}}
\newlength\chapnumb
\setlength\chapnumb{\linewidth}
\newcommand\mychap{%
\titleformat{\chapter}[display]
{\normalfont \Huge \bfseries}{}{0pt}
{ Ch:\thechapter\ ##1}%
}
\begin{document}
\mychapN
\chapter{Introduction}
\mychap
\chapter{Analysis}
\mychapN
\chapter{Results}
\end{document}