對於所示 MWE 中的表，無論顯示的各種問題如何，我都無法解決這個特定問題，即連字符不適用於多行/合併行。有辦法解決這個問題嗎？正如您所看到的，除了帶有multirow命令的行之外，所有行都已正確連字符。
此外，當使用此指令\rule{0pt}{25pt}來修復方程式的間距時：相鄰單元格的垂直居中被弄亂。
最後，有沒有辦法在景觀環境中製作這樣的桌子，同時保持兩件事？
- 縱向類型的文件。
- 使用其他套件（例如
lscape，旋轉...）時，表格會旋轉，但頁首和頁尾不會旋轉。我需要表格處於橫向模式，而頁首和頁尾保留在所有頁面的頂部和底部，無論它們是橫向還是縱向。
3個問題：
- 多行連字符
- 使用時保持垂直對齊
\rule{0pt}{25pt} - 無論頁面是橫向還是縱向，都保持頁面頂部和底部的頁首和頁尾位置。
\documentclass[a4paper,12pt,twoside]{book}
\usepackage[a4paper,top=2.5cm,bottom=2.5cm,margin=2.5cm,bindingoffset=0.5cm]{geometry}
\usepackage[bidi=basic,layout=lists.tabular]{babel}
\babelfont[english]{rm}{Times New Roman}
\usepackage[table]{xcolor}
\usepackage{tabu,multirow}
\usepackage{array}
\newcolumntype{?}[1]{!{\vrule width #1}}
\usepackage{booktabs}
\setlength{\belowrulesep}{0pt}
\setlength{\belowbottomsep}{0pt}
\setlength{\aboverulesep}{0pt}
\setlength{\belowrulesep}{0pt}
\setlength{\abovetopsep}{0pt}
\usepackage{longtable}
\usepackage{makecell}
\usepackage{boldline}
\usepackage{hhline}
\usepackage{rotating}
\usepackage{amsmath}
\usepackage{amsthm}
\usepackage{amssymb}
\newtheorem{thm}{Theorem}[chapter]
\newtheorem{lem}[thm]{Lemma}
\theoremstyle{definition}
\newtheorem{dfn}[thm]{Definition}
\begin{document}
\begin{longtable}{?{1mm}>{\centering\arraybackslash}m{0.2\textwidth}|m{0.2\textwidth}|m{0.1\textwidth}|m{0.1\textwidth}|m{0.2\textwidth}|m{0.1\textwidth}?{1mm}}
\toprule[1mm]
& \multicolumn{2}{c?{1mm}}{\textbf{U.S. CUSTOMARY UNITS}} & & \multicolumn{2}{c?{1mm}}{\textbf{Equivlent SI Unit}} \\
\cmidrule[1.25pt]{2-3}
\cmidrule[1.25pt]{5-6}
\multirow{-2}{*}{\textbf{Type of quantity}} & \textbf{Unit} & \textbf{Abbreviation} &
\multirow{-2}{*}{\textbf{Multiplication factor}} & \textbf{Unit} & \textbf{Abbreviation} \\
\Xhline{1.5pt}
\endfirsthead
\toprule[1mm]
& \multicolumn{2}{c?{1mm}}{\textbf{U.S. CUSTOMARY UNITS}} & & \multicolumn{2}{c?{1mm}}{\textbf{Equivlent SI Unit}} \\
\cmidrule[1.25pt]{2-3}
\cmidrule[1.25pt]{5-6}
\multirow{-2}{*}{\textbf{Type of quantity}} & \textbf{Unit} & \textbf{Abbreviation} &
\multirow{-2}{*}{\textbf{Multiplication factor}} & \textbf{Unit} & \textbf{Abbreviation} \\
\Xhline{1.5pt}
\endhead
%\toprule
\multicolumn{6}{l}{\textbf{*:Exact values}}\\
\Xhline{1pt} %\midrule[1.5pt]
\multicolumn{6}{c}{\textbf{Continued}}\\
\bottomrule
\endfoot
\bottomrule[1mm]
\endlastfoot
\rowcolor{gray!25}
& pound-foot & Ib-ft & 1.3558 & & \\
\cmidrule[0.5pt]{2-4} %\Xcline {2-3}{1pt}
\rowcolor{gray!25}
\multirow{-2}{*}{\textbf{Moment of force}}& pound-inch & Ib-in. & 0.1129 8 & \multirow{-2}{*}{newton-meter} & \multirow{-2}{*}{N . m} \\
\Xhline{1pt} %\midrule[1.5pt]
\rowcolor{white}
\rule{0pt}{25pt}
& $\dfrac{foot \- pound}{minute}$ & $\dfrac{ft \- Ib}{min}$ & 2.2597 \ast $\medspace 10^{-2}$ & & \\
\cmidrule[0.5pt]{2-4} %\Xcline {2-3}{1pt}
\rowcolor{white}
\rule{0pt}{25pt}
\multirow{-2}{*}{\textbf{Power}}& horsepower = $550 \medspace \ast \medspace \dfrac{foot \- pound}{second}$ & $550 \medspace \ast \medspace \dfrac{ft \- Ib}{sec}$ & 7.4570 \ast $10^{-2} 10$ & \multirow{-2}{*}{watt} & \multirow{-2}{*}{W} \\
\Xhline{1pt} %\midrule[1.5pt]
\rowcolor{white}
& atmosphere (std) & std = 1.0133 \ast $\medspace \dfrac{Ib}{in.^{2}}$ & 1.0133 \ast $\medspace 10^{5}$ & & \\
\cmidrule[0.5pt]{2-4} %\Xcline {2-3}{1pt}
\rowcolor{white}
& $\dfrac{pound}{foot^{2}}$ & $\dfrac{Ib}{ft^{2}}$ & 4.7880 \ast 10 & & \\
\cmidrule[0.5pt]{2-4} %\Xcline {2-3}{1pt}
\rowcolor{white}
\multirow{-3}{*}{\textbf{Pressure, stress}}& $\dfrac{pound}{inch^{2}}$ & $\dfrac{Ib}{in.^{2}}$ & 6.8948 \ast $\medspace 10^{3}$ & \multirow{-3}{*}{pascal} & \multirow{-3}{*}{Pa = $\dfrac{N}{m^{2}}$} \\
\Xhline{1pt} %\midrule[1.5pt]
\rowcolor{gray!25}
\textbf{Spring constant} & $\dfrac{pound}{inch}$ & $\dfrac{Ib}{in.}$ & 1.7513 \ast $\medspace 10^{2}$ & $\dfrac{newton}{meter}$ & $\dfrac{kg \medspace \cdot \medspace m^{2}}{s}$ \\
\Xhline{1pt} %\midrule[1.5pt]
\rowcolor{white}
& $\dfrac{foot}{second}$ & $\dfrac{ft}{sec}$ & 3.048 \ast $\medspace 10^{-1}$ & & \\
\cmidrule[0.5pt]{2-4} %\Xcline {2-3}{1pt}
\rowcolor{white}
& knot ($\dfrac{nautical \medspace mile}{hour}$) & $\dfrac{nautical \medspace mi}{hr}$ & 5.1444 \ast $\medspace 10^{-1}$ & & \\
\cmidrule[0.5pt]{2-4} %\Xcline {2-3}{1pt}
\rowcolor{white}
& & & 4.4704 \ast $\medspace 10^{-1}$* & \multirow{-3}{*}{$\dfrac{meter}{second}$} & \multirow{-3}{*}{$\dfrac{m}{s}$} \\
\cmidrule[0.5pt]{4-6} %\Xcline {2-3}{1pt}
\rowcolor{white}
\multirow{-4}{*}{\textbf{Velocity}}& \multirow{-2}{*}{ $\dfrac{mile}{hour}$} & \multirow{-2}{*}{$\dfrac{mi}{hr}$} & 1.6093 & $\dfrac{kilometer}{hour}$ & $\dfrac{km}{h}$ \\
\Xhline{1pt} %\midrule[1.5pt]
\rowcolor{white}
& British thermal unit & BTU & 1.0551 \ast $\medspace 10^{3}$ & & \\
\cmidrule[0.5pt]{2-4} %\Xcline {2-3}{1pt}
\rowcolor{white}
& foot-pound force & ft-Ib & 1.3558 & & \\
\cmidrule[0.5pt]{2-4} %\Xcline {2-3}{1pt}
\rowcolor{white}
\multirow{-3}{*}{\textbf{Work, Energy}}& kilowatt-hour & kw-h & 3.6 \ast $\medspace 10^{6}$* & \multirow{-3}{*}{joule} & \multirow{-3}{*}{J} \\
\Xhline{1pt} %\midrule[1.5pt]
\end{longtable}
\end{document}
