zhfs真的存在于你的电脑里吗？正常来讲，能够使用的字体应该都在 fc-list 的结果里，这个命令你可以先查查怎么用。
zhfs真的存在于你的电脑里吗？正常来讲，能够使用的字体应该都在 fc-list 的结果里，这个命令你可以先查查怎么用。
很早以前我见过这样的答案，但是我现在忘了在哪看到的了。
\documentclass{ctexart}
\usepackage{xeCJKfntef}
\usepackage{xcolor}
\usepackage{tagging}
\usetag{ans}% 注释掉该行语句不显示答案
\newcommand{\answer}[1]{\iftagged{ans}{\CJKunderline{#1}}{{\CJKunderline[textformat=\color{white}]{#1}}}}
\begin{document}
圆是\answer{到定点的距离等于定长的点的集合}.
圆是\answer{到定点的距离等于定长的点的集合}.
圆是\answer{到定点的距离等于定长的点的集合}.
圆是\answer{到定点的距离等于定长的点的集合}.
\end{document}这么提问是希望我们对着图片再打一遍代码吗 :)
align 和它的不带标号的版本 align* 可以排列多列对齐的公式，列与列之间用 & 分隔，而且在 & 左右的公式分别按照右对齐、左对齐的方式排列，所以很多人在用多个 & 时就从观感上容易产生很大的间距，相信这点你已经知道。在使用时，& 一般会放 = 的前面：
\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{align*}
x &= t & x &= \cos t & x &= t^2 \\
y &= 2t & y &= \sin(t+1) & y &= e^t
\end{align*}
\end{document}
当然有时也可以放在二元运算符前面，只不过这时我通常会这么用（lshort-zh-cn 中也有类似的用法）
\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{align*}
(a+b)^2 ={}& a^2 + b^2\\
& + 2ab
\end{align*}
\end{document}
alignat 及不带标号的 alignat* 则不在列与列之间产生间距，但可以手工增加间距。alignat 环境有一个参数，表示每行要对齐的公式个数，每两列一组，如下面把列间距设定为一个 \quad 的距离
\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{alignat*}{2}
x &= \sin t & \quad & t \ge 0 \\
y &= \cos t & & t < 0
\end{alignat*}
\end{document}
看第2行第3列我没用 \quad，但是间距依然保留下来，这是因为上一行的 \quad 位置必须在每一行都有所体现。它的这种特性就非常适合排版线性方程组
\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{alignat*}{6}
& x_1 & & + x_2 & & +x_3 & &+ x_4 & &+ x_5 & &=1 \\
& x_1 & & & & +x_3 & & & & + x_5 & &=2 \\
& & & \mathbin{\phantom{+}}x_2 & & & & +x_4 & & & &=3
\end{alignat*}
\end{document}
关于 \mathbin，可以参考 tex.stackexchange.com 的解释。\phantom 则是产生一个幻影。
可以考虑使用 wrpstuff 包处理图文混排，然后 tasks 包做题目的排版
biblatex 最好就用 biber，用 bibtex 的话，功能依旧受限。
不要用
\documentclass[mathserif]{beamer}换成
\documentclass{beamer}
\usefonttheme[onlymath]{serif}你大约是没读过手册。
\documentclass{article}
\usepackage{mathtools}
\begin{document}
\begin{equation*}
\otimes
\end{equation*}
\end{document}还是下午的问题。你核心的地方是 \maketitle 出错而导致编译无法通过。你拿到这个模板之后，用一些有意义的单词来取代它模板原本的东西都好过直接用 * 来替换。
我现在把我改过的文本贴在这里。
%%
%% Copyright 2019-2021 Elsevier Ltd
%%
%% This file is part of the 'CAS Bundle'.
%% --------------------------------------
%%
%% It may be distributed under the conditions of the LaTeX Project Public
%% License, either version 1.2 of this license or (at your option) any
%% later version. The latest version of this license is in
%% http://www.latex-project.org/lppl.txt
%% and version 1.2 or later is part of all distributions of LaTeX
%% version 1999/12/01 or later.
%%
%% The list of all files belonging to the 'CAS Bundle' is
%% given in the file `manifest.txt'.
%%
%% Template article for cas-sc documentclass for
%% single column output.
\newtheorem{theorem}{Theorem}
\newtheorem{proposition}{Proposition}
%\newtheorem{assumption}{Assumption}
\newtheorem{definition}{Definition}
\newtheorem{lemma}{Lemma}
\newtheorem{corollary}{Corollary}
\newtheorem{fact}{Fact}
\newtheorem{conjecture}{Conjecture}
\newtheorem{as}{Assumption}
\newtheorem{ias}{IPC Assumption}
%\newcommand{\qed}{{\mbox{} \hspace*{\fill}{\vrule height5pt width4pt
%depth0pt}}\\}
\newcommand{\lqed}{{\mbox{} \hspace*{\fill}{\vrule height4pt width3pt
depth0pt}}}
\def\M{\hspace*{0.75em}}
\def\MM{\hspace*{2em}}
\def\MMM{\hspace*{2.25em}}
\def\MMMM{\hspace*{3em}}
\def\MMMMM{\hspace*{3.75em}}
\def\MMMMMM{\hspace*{4.5em}}
\documentclass[a4paper,fleqn]{cas-sc}
% If the frontmatter runs over more than one page
% use the longmktitle option.
%\documentclass[a4paper,fleqn,longmktitle]{cas-sc}
%\usepackage[numbers]{natbib}
%\usepackage[authoryear]{natbib}
\usepackage[authoryear,longnamesfirst]{natbib}
%%%Author macros
\def\tsc#1{\csdef{#1}{\textsc{\lowercase{#1}}\xspace}}
\tsc{WGM}
\tsc{QE}
%%%
% Uncomment and use as if needed
%\newtheorem{theorem}{Theorem}
%\newtheorem{lemma}[theorem]{Lemma}
%\newdefinition{rmk}{Remark}
%\newproof{pf}{Proof}
%\newproof{pot}{Proof of Theorem \ref{thm}}
\begin{document}
\let\WriteBookmarks\relax
\def\floatpagepagefraction{1}
\def\textpagefraction{.001}
% Short title
\shorttitle{This is an MWE}
% Short author
\shortauthors{Li, Tao}
% Main title of the paper
\title[mode = title]{one title}
% Title footnote mark
% eg: \tnotemark[1]
%\tnotemark[1]
% Title footnote 1.
% eg: \tnotetext[1]{Title footnote text}
%\tnotetext[1]{<tnote text>}
% First author
%
% Options: Use if required
% eg: \author[1,3]{Author Name}[type=editor,
% style=chinese,
% auid=000,
% bioid=1,
% prefix=Sir,
% orcid=0000-0000-0000-0000,
% facebook=<facebook id>,
% twitter=<twitter id>,
% linkedin=<linkedin id>,
% gplus=<gplus id>]
\author[1]{author one}
%[type=editor,
%style=chinese,
%auid=000,
%bioid=1,
%prefix=Sir,
%orcid=0000-0000-0000-0000,
%facebook=<facebook id>,
%twitter=<twitter id>,
%linkedin=<linkedin id>,
%gplus=<gplus id>]
% Corresponding author indication
\cormark[1]
% Footnote of the first author
\fnmark[1]
% Email id of the first author
\ead{}
% URL of the first author
% Credit authorship
% eg:
\credit{Conceptualization of this study, Methodology, Software}
%\credit{<Credit authorship details>}
% Address/affiliation
\affiliation[1]{organization={School of Management, Huazhong University of Technology and Science},
addressline={Wu Han},
postcode={430074},
state={Hu Bei},
country={China}}
\author[2]{author two}%[<options>]
% Footnote of the second author
\fnmark[2]
% Email id of the second author
%\ead{jjjh}
% URL of the second author
%\ead[url]{iijb}
% Credit authorship
%\credit{iuhb}
% Address/affiliation
\affiliation[2]{organization={Department of Industrial Engineering and Logistics Management, Hong Kong University of Science and Technology},
addressline={Kowloon, Hong Kong}}
% Footnote text
%\fntext[1]{mmmm}
% For a title note without a number/mark
%\nonumnote{}
% Here goes the abstract
\begin{abstract}
Well, now the abstract is to be continue, since the paper is unfinished. Later the authors will fill it.
\end{abstract}
% Use if graphical abstract is present
%\begin{graphicalabstract}
%\includegraphics{}
%\end{graphicalabstract}
% Research highlights
\begin{highlights}
\item first.
\item second.
\end{highlights}
% Keywords
% Each keyword is seperated by \sep
\begin{keywords}
one word \sep another word
\end{keywords}
\maketitle
\section{Introduction}
% Main text
The previous researches(\citealt{Anand2020}) about pollution regulations mainly concentrated on its effects on firms, customers and social
We introduce the problem's setting in Section~\ref{formulation}.
\section{Mathematical Formulation}\label{formulation}
We consider
\begin{equation}\label{balance}
\sum_{i\in\overline S}x^0_i-\sum_{i\in \overline S}a_i=\sum_{i\in\overline S}(x^0_i-a_i)^+-\sum_{i\in\overline S}(a_i-x^0_i)^+=0.
\end{equation}
We denote $\tilde X^0(p)$ as the set of $x^0$ that satisfies Eq. (\ref{balance})
% To print the credit authorship contribution details
\printcredits
\bibliographystyle{nonumber}
\begin{thebibliography}{}
\bibitem[Anand and Giraud-Carrier (2020)]{Anand2020}
Anand K S , Giraud-Carrier F C. 2020. Pollution Regulation of Competitive Markets. {\em Management Science}, {\bf 66(9)}, 3799-4358.
\end{thebibliography}
%% Loading bibliography style file
%\bibliographystyle{model1-num-names}
%\bibliographystyle{cas-model2-names}
% Loading bibliography database
%\bibliography{}
% Biography
%\bio{}
% Here goes the biography details.
%\endbio
%\bio{pic1}
% Here goes the biography details.
%\endbio
\end{document}应该用它就可以编译过了。编译命令是
latexmk -pdf -synctex=1 mwe.tex
问 在 ctexart 文档中，使用\setCJKmainfont{}命令将文档的默认字体设置为仿宋 zhfs