我打算使用提供的模板将我的研究论文发送到期刊。但是，我发现显示的数学不居中（在期刊上发表的论文将方程式居中）。下面我提供了模板和oeko.cls（不是全部，太长了，无法在此处发布）文档类文件。
\documentclass[oeko]{oeko}
%Remove any % below to load the required packages
\usepackage{latexsym}
\usepackage{graphicx}
\usepackage{natbib}
\usepackage{amsmath}
\begin{document}
\title{Persistence......}
\titlerunning{Persistence.....}
\subtitle{Do you have a subtitle?} % Insert a subtitle or remove this line
\gertitle{F\"ugen Sie den dt. Titel hier ein}
\gersubtitle{Haben Sie einen dt. Untertitel?}
\author{Aidil .....}% etc
\thanks{Thanks...}}
\authorrunning{Aidil....}
%
\jel{Insert JEL here}
%
\keywords{Finite elements, Detonation, Safety} %end of abstract
%
\maketitle
\begin{abstract}
My abstract
\end{abstract}
% Start
\section{Introduction}
\label{intro}
Testing of FRUH was based on the premise that the log forward exchange rate $(f_t)$ provides an unbiased predictor of the future log spot rate $(s_{t+1})$ or $E_ts_{t+1}=f_t$ . By subtracting the log spot rate from both sides of the equation, we can obtain the UIP:
\begin{align}
E_ts_{t+1}-s_t=f_t-s_t
\end{align}
Following \cite{fama1984forward}, testing the hypothesis was based on the regression framework of equation (1):
\begin{align}
s_{t+1}-s_t=\beta_1+\beta_2(f_t-s_t)+\varepsilon_{t+1}
\end{align}
\section{Section title}
\label{sec:1}
and
\end{document}
% end of file template.tex
文档类oeko.cls（部分内容，希望足以检测出问题）
% DOCUMENT CLASS -- version 1.1 for LaTeX2e
\~}
\NeedsTeXFormat{LaTeX2e}[1995/12/01]
\ProvidesClass{oeko}[2009/05/25
^^JLaTeX document class for Jahrb?cher - version 1.1]
\newcommand\@ptsize{}
\newif\if@restonecol
\newif\if@titlepage
\@titlepagefalse
\DeclareOption{a4paper}
{\setlength\paperheight {297mm}%
\setlength\paperwidth {210mm}}
\DeclareOption{10pt}{\renewcommand\@ptsize{0}}
\DeclareOption{twoside}{\@twosidetrue \@mparswitchtrue}
\DeclareOption{draft}{\setlength\overfullrule{5pt}}
\DeclareOption{final}{\setlength\overfullrule{0pt}}
\DeclareOption{onecolumn}{\@onecolumntrue}
\DeclareOption{fleqn}{\input{fleqn.clo}\AtEndOfClass{\mathindent\z@}}
\let\if@mathematic\iftrue
\let\if@numbook\iffalse
\DeclareOption{numbook}{\let\if@envcntsect\iftrue
\AtEndOfPackage{%
\renewcommand\thefigure{\thesection.\@arabic\c@figure}%
\renewcommand\thetable{\thesection.\@arabic\c@table}%
\renewcommand\theequation{\thesection.\@arabic\c@equation}%
\@addtoreset{figure}{section}%
\@addtoreset{table}{section}%
\@addtoreset{equation}{section}%
}%
}
\DeclareOption{openbib}{%
\AtEndOfPackage{%
\renewcommand\@openbib@code{%
\advance\leftmargin\bibindent
\itemindent -\bibindent
\listparindent \itemindent
\parsep \z@
}%
\renewcommand\newblock{\par}}%
}
%
\let\if@runhead\iffalse
\DeclareOption{runningheads}{\let\if@runhead\iftrue}
\let\if@smartrunh\iffalse
\DeclareOption{smartrunhead}{\let\if@smartrunh\iftrue}
\DeclareOption{nosmartrunhead}{\let\if@smartrunh\iffalse}
\let\if@envcntreset\iffalse
\DeclareOption{envcountreset}{\let\if@envcntreset\iftrue}
\let\if@envcntsame\iffalse
\DeclareOption{envcountsame}{\let\if@envcntsame\iftrue}
\let\if@envcntsect\iffalse
\DeclareOption{envcountsect}{\let\if@envcntsect\iftrue}
\let\if@referee\iffalse
\DeclareOption{referee}{\let\if@referee\iftrue}
\def\makereferee{\def\baselinestretch{2}}
\let\if@instindent\iffalse
\DeclareOption{instindent}{\let\if@instindent\iftrue}
\let\if@smartand\iffalse
\DeclareOption{smartand}{\let\if@smartand\iftrue}
\let\if@spthms\iftrue
\DeclareOption{nospthms}{\let\if@spthms\iffalse}
\let\switch@texts\relax
\DeclareOption{deutsch}{\def\switch@texts{\ds@deutsch}}
\DeclareOption{francais}{\def\switch@texts{\ds@francais}}
%
\let\journalopt\@empty
\DeclareOption*{\InputIfFileExists{oeko.clo}{%
\let\journalopt\CurrentOption}{%
\ClassWarning{Jahrbuecher}{Specified option or subpackage
"\CurrentOption" not found -}\OptionNotUsed}}
\ExecuteOptions{a4paper,twoside,10pt,instindent}
\ProcessOptions
\ifx\journalopt\@empty
\ClassError{Jahrbuecher}{No valid journal specified in option list}{}
\expandafter\stop
\fi
%
\if@smartrunh\AtEndDocument{\islastpageeven\getlastpagenumber}\fi
%
\DeclareMathSymbol{\Gamma}{\mathalpha}{letters}{"00}
\DeclareMathSymbol{\Delta}{\mathalpha}{letters}{"01}
\DeclareMathSymbol{\Theta}{\mathalpha}{letters}{"02}
\DeclareMathSymbol{\Lambda}{\mathalpha}{letters}{"03}
\DeclareMathSymbol{\Xi}{\mathalpha}{letters}{"04}
\DeclareMathSymbol{\Pi}{\mathalpha}{letters}{"05}
\DeclareMathSymbol{\Sigma}{\mathalpha}{letters}{"06}
\DeclareMathSymbol{\Upsilon}{\mathalpha}{letters}{"07}
\DeclareMathSymbol{\Phi}{\mathalpha}{letters}{"08}
\DeclareMathSymbol{\Psi}{\mathalpha}{letters}{"09}
\DeclareMathSymbol{\Omega}{\mathalpha}{letters}{"0A}
%
\setlength\parindent{15\p@}
\setlength\smallskipamount{3\p@ \@plus 1\p@ \@minus 1\p@}
\setlength\medskipamount{6\p@ \@plus 2\p@ \@minus 2\p@}
\setlength\bigskipamount{12\p@ \@plus 4\p@ \@minus 4\p@}
\setlength\headheight{12\p@}
\setlength\headsep {16.74dd}
\setlength\topskip {10\p@}
\setlength\footskip{30\p@}
\setlength\maxdepth{.5\topskip}
%
\@settopoint\textwidth
\setlength\marginparsep {10\p@}
\setlength\marginparpush{5\p@}
\setlength\topmargin{-10pt}
\if@twocolumn
\setlength\oddsidemargin {-30\p@}
\setlength\evensidemargin{-30\p@}
\else
\setlength\oddsidemargin {\z@}
\setlength\evensidemargin{\z@}
\fi
\setlength\marginparwidth {48\p@}
\setlength\footnotesep{8\p@}
\setlength{\skip\footins}{9\p@ \@plus 4\p@ \@minus 2\p@}
\setlength\floatsep {12\p@ \@plus 2\p@ \@minus 2\p@}
\setlength\textfloatsep{20\p@ \@plus 2\p@ \@minus 4\p@}
\setlength\intextsep {20\p@ \@plus 2\p@ \@minus 2\p@}
\setlength\dblfloatsep {12\p@ \@plus 2\p@ \@minus 2\p@}
\setlength\dbltextfloatsep{20\p@ \@plus 2\p@ \@minus 4\p@}
\setlength\@fptop{0\p@}
\setlength\@fpsep{12\p@ \@plus 2\p@ \@minus 2\p@}
\setlength\@fpbot{0\p@ \@plus 1fil}
\setlength\@dblfptop{0\p@}
\setlength\@dblfpsep{12\p@ \@plus 2\p@ \@minus 2\p@}
\setlength\@dblfpbot{0\p@ \@plus 1fil}
\setlength\partopsep{2\p@ \@plus 1\p@ \@minus 1\p@}
\def\@listi{\leftmargin\leftmargini
\parsep \z@
\topsep 6\p@ \@plus2\p@ \@minus4\p@
\itemsep\parsep}
\let\@listI\@listi
\@listi
\def\@listii {\leftmargin\leftmarginii
\labelwidth\leftmarginii
\advance\labelwidth-\labelsep
\topsep \z@
\parsep \topsep
\itemsep \parsep}
\def\@listiii{\leftmargin\leftmarginiii
\labelwidth\leftmarginiii
\advance\labelwidth-\labelsep
\topsep \z@
\parsep \topsep
\itemsep \parsep}
\def\@listiv {\leftmargin\leftmarginiv
\labelwidth\leftmarginiv
\advance\labelwidth-\labelsep}
\def\@listv {\leftmargin\leftmarginv
\labelwidth\leftmarginv
\advance\labelwidth-\labelsep}
\def\@listvi {\leftmargin\leftmarginvi
\labelwidth\leftmarginvi
\advance\labelwidth-\labelsep}
%% End of file `oeko.cls'.
答案1
@Bernard 在评论中指出，在类文件（第 306-309 行）中指定了左对齐\usepackage[fleqn]{amsmath}。他建议通过在序言中添加以下几行将数学边距更改为正值：
\makeatletter
\setlength{\@mathmargin}{2em}
\makeatother
我们已经尝试过，并且取得了积极的效果。
更彻底地撤消设置的修改amsmath如下：
\makeatletter
\@fleqnfalse
\@mathmargin\@centering
\makeatother
然而，@Paul Gessler 的这条评论应该认真考虑：
如果您要向其提交论文的期刊提供了类别，则只需按原样使用该类别即可。如果期刊希望方程式居中，那么他们的工作就是这样做。