答案1
我建议您采用一个tabularx
环境并允许在所有标题单元格中自动换行。
\documentclass[10pt]{article}
\usepackage{tabularx,ragged2e,booktabs,siunitx}
\newcolumntype{C}{>{\Centering}X}
\begin{document}
\begin{table}[t]
\caption{Choice of test conditions}
\begin{tabularx}{\textwidth}{@{} CCCCC @{}}
\toprule
Set of Conditions &
Temperature [\si{\celsius}] &
Desired RH differential [\%] &
RH of upper chamber [\%] &
RH of lower chamber [\%]\\
\midrule
\end{tabularx}
\end{table}
\end{document}