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我在论文中使用了 longtable，在此之前，我有一个包含文本的小段落。更改 longtable 的字体大小后，段落中的文本间距会发生变化。有人有解决方法吗？
我使用以下代码：
\chapter{R-values/offset values table}
Table \ref{Rvalues_all} shows the R-values and offset values of all tests which are performed successfully. The values are left blank in tests were some data was irrelevant, for instance tractor acceleration y in acceleration and braking test. Furthermore, there are some abbreviations used, \textit{ax} denoted acceleration x, with \textit{r} yaw velocity is indicated, \textit{ay} denotes acceleration y and \textit{$\theta$} is used for articulation angle.
\begin{footnotesize}
\begin{longtable}{|l|l|l|l|l|l|l|l|l|l|l|l|l|l|l|}
\hline
\multirow{3}{*}{\textbf{No.}} & \multicolumn{7}{l|}{\textbf{Rvalues}} & \multicolumn{7}{l|}{\textbf{Offset values {[}\%{]}}} \\ \cline{2-15}
& \multicolumn{3}{l|}{\textbf{Tractor}} & \multicolumn{3}{l|}{\textbf{Semitrailer}} & \textbf{} & \multicolumn{3}{l|}{\textbf{Tractor}} & \multicolumn{3}{l|}{\textbf{Semitrailer}} & \textbf{} \\ \cline{2-15}
& \textbf{ax} & \textbf{r} & \textbf{ay} & \textbf{ax} & \textbf{r} & \textbf{ay} & \textbf{$\theta$} & \textbf{ax} & \textbf{r} & \textbf{ay} & \textbf{ax} & \textbf{r} & \textbf{ay} & \textbf{$\theta$} \\ \hline
01 & 0.95 & - & - & 0.94 & - & - & - & 2.44 & - & - & 0.25 & - & - & - \\ \hline
02 & 0.97 & - & - & 0.96 & - & - & - & 1.11 & - & - & 0.02 & - & - & - \\ \hline
03 & 0.95 & - & - & 0.94 & - & - & - & 1.28 & - & - & 0.10 & - & - & - \\ \hline
04 & 0.95 & - & - & 0.94 & - & - & - & 1.16 & - & - & -0.83 & - & - & - \\ \hline
05 & 0.97 & - & - & 0.96 & - & - & - & 0.50 & - & - & -1.03 & - & - & - \\ \hline
06 & 0.99 & - & - & 0.98 & - & - & - & 0.56 & - & - & 0.01 & - & - & - \\ \hline
07 & 0.98 & - & - & 0.98 & - & - & - & 0.32 & - & - & 0.11 & - & - & - \\ \hline
08 & 0.91 & - & - & 0.91 & - & - & - & 0.62 & - & - & 0.16 & - & - & - \\ \hline
09 & 0.59 & 0.91 & 0.41 & 0.61 & 0.94 & 0.27 & 0.93 & 1.31 & -0.50 & -11.2 & 1.01 & 1.64 & -6.32 & 2.53 \\ \hline
10 & 0.73 & 0.96 & 0.76 & 0.71 & 0.86 & 0.21 & 0.89 & 1.05 & -1.89 & -18.7 & 0.72 & 0.12 & -6.94 & 2.67 \\ \hline
11 & 0.65 & 0.98 & 0.84 & 0.62 & 0.95 & 0.43 & 0.97 & 1.76 & -0.95 & -13.9 & 1.12 & -0.79 & -6.17 & 1.88 \\ \hline
12 & 0.62 & 0.98 & 0.82 & 0.62 & 0.98 & 0.40 & 0.99 & 1.36 & -0.73 & -15.1 & 1.19 & 1.67 & -15.8 & 2.14 \\ \hline
13 & 0.61 & 0.98 & 0.94 & 0.58 & 0.98 & 0.83 & 0.73 & 0.75 & 7.83 & -2.37 & -3.85 & 8.34 & 4.44 & 6.70 \\ \hline
14 & 0.55 & 0.97 & 0.96 & 0.59 & 0.98 & 0.92 & 0.97 & 0.23 & 7.91 & 3.11 & -4.83 & 8.43 & 5.80 & 6.57 \\ \hline
15 & 0.59 & 0.99 & 0.86 & 0.50 & 0.99 & 0.77 & 1.00 & 2.94 & 5.32 & 0.41 & 4.50 & 7.84 & 2.01 & -1.20 \\ \hline
17 & 0.67 & 0.98 & 0.98 & 0.64 & 0.99 & 0.91 & 0.88 & 1.22 & 4.06 & 3.66 & 7.33 & 5.23 & 4.29 & -8.75 \\ \hline
18 & 0.95 & - & - & - & - & - & - & 1.22 & - & - & - & - & - & - \\ \hline
19 & 0.97 & - & - & - & - & - & - & 0.46 & - & - & - & - & - & - \\ \hline
20 & 0.97 & - & - & - & - & - & - & 0.60 & - & - & - & - & - & - \\ \hline
21 & 0.99 & - & - & - & - & - & - & 0.34 & - & - & - & - & - & - \\ \hline
22 & 0.99 & - & - & - & - & - & - & 0.64 & - & - & - & - & - & - \\ \hline
23 & 0.99 & - & - & - & - & - & - & 0.10 & - & - & - & - & - & - \\ \hline
24 & 0.99 & - & - & - & - & - & - & 0.59 & - & - & - & - & - & - \\ \hline
25 & 0.99 & - & - & - & - & - & - & 0.10 & - & - & - & - & - & - \\ \hline
26 & 0.99 & - & - & - & - & - & - & 0.35 & - & - & - & - & - & - \\ \hline
28 & 0.76 & 0.99 & 0.82 & - & - & - & - & 0.47 & 6.64 & -1.22 & - & - & - & - \\ \hline
30 & 0.80 & 0.99 & 0.99 & - & - & - & - & -0.49 & 7.97 & 9.97 & - & - & - & - \\ \hline
31 & 0.88 & 0.99 & 0.97 & - & - & - & - & 1.64 & 5.23 & -3.38 & - & - & - & - \\ \hline
32 & 0.92 & 1.00 & 0.99 & - & - & - & - & 0.65 & 4.79 & -0.18 & - & - & - & - \\ \hline
33 & 0.97 & 1.00 & 0.88 & - & - & - & - & 0.89 & -0.83 & -16.9 & - & - & - & - \\ \hline
34 & 0.94 & 0.99 & 0.89 & - & - & - & - & 1.67 & -2.62 & -15.4 & - & - & - & - \\ \hline
35 & 0.57 & 1.00 & 0.92 & - & - & - & - & 1.40 & -2.82 & -12.9 & - & - & - & - \\ \hline
36 & 0.95 & 1.00 & 0.95 & - & - & - & - & 0.47 & -0.70 & -13.0 & - & - & - & - \\ \hline
37 & 0.98 & 1.00 & 0.98 & - & - & - & - & 0.39 & -1.13 & -9.59 & - & - & - & - \\ \hline
38 & 0.99 & 1.00 & 0.98 & - & - & - & - & 0.70 & -0.35 & -9.37 & - & - & - & - \\ \hline
39 & 0.93 & 1.00 & 0.98 & - & - & - & - & 0.64 & -0.74 & -2.89 & - & - & - & - \\ \hline
40 & 0.98 & 1.00 & 0.99 & - & - & - & - & 0.29 & -0.75 & -4.23 & - & - & - & - \\ \hline
41 & 0.90 & 1.00 & 0.97 & - & - & - & - & 0.48 & 0.83 & -9.68 & - & - & - & - \\ \hline
42 & 0.95 & 1.00 & 0.99 & - & - & - & - & 0.54 & 1.14 & -4.27 & - & - & - & - \\ \hline
43 & 0.91 & 1.00 & 0.96 & - & - & - & - & 1.83 & -4.63 & -13.6 & - & - & - & - \\ \hline
44 & 0.90 & 1.00 & 0.93 & - & - & - & - & 0.58 & -2.60 & -8.68 & - & - & - & - \\ \hline
45 & 0.94 & 1.00 & 0.98 & - & - & - & - & 2.00 & -4.73 & -9.07 & - & - & - & - \\ \hline
46 & 0.95 & 1.00 & 0.98 & - & - & - & - & 1.70 & -4.29 & -7.23 & - & - & - & - \\ \hline
\caption{R-values and offset values of all tests performed}
\label{Rvalues_all}
\end{longtable}
\end{footnotesize}
答案1
字体大小会改变整个段落的间距。为了防止 LaTeX 改变上面段落的间距，你应该用\par或 空行适当地分隔表格和段落：
\documentclass{report}
\usepackage{longtable}
\usepackage{multirow}
\begin{document}
\chapter{R-values/offset values table}
Table \ref{Rvalues_all} shows the R-values and offset values of all tests which are performed successfully. The values are left blank in tests were some data was irrelevant, for instance tractor acceleration y in acceleration and braking test. Furthermore, there are some abbreviations used, \textit{ax} denoted acceleration x, with \textit{r} yaw velocity is indicated, \textit{ay} denotes acceleration y and \textit{$\theta$} is used for articulation angle.
\begin{footnotesize}
\begin{longtable}{|l|l|l|l|l|l|l|l|l|l|l|l|l|l|l|}
\hline
\multirow{3}{*}{\textbf{No.}} & \multicolumn{7}{l|}{\textbf{Rvalues}} & \multicolumn{7}{l|}{\textbf{Offset values {[}\%{]}}} \\ \cline{2-15}
& \multicolumn{3}{l|}{\textbf{Tractor}} & \multicolumn{3}{l|}{\textbf{Semitrailer}} & \textbf{} & \multicolumn{3}{l|}{\textbf{Tractor}} & \multicolumn{3}{l|}{\textbf{Semitrailer}} & \textbf{} \\ \cline{2-15}
& \textbf{ax} & \textbf{r} & \textbf{ay} & \textbf{ax} & \textbf{r} & \textbf{ay} & \textbf{$\theta$} & \textbf{ax} & \textbf{r} & \textbf{ay} & \textbf{ax} & \textbf{r} & \textbf{ay} & \textbf{$\theta$} \\ \hline
01 & 0.95 & - & - & 0.94 & - & - & - & 2.44 & - & - & 0.25 & - & - & - \\ \hline
02 & 0.97 & - & - & 0.96 & - & - & - & 1.11 & - & - & 0.02 & - & - & - \\ \hline
03 & 0.95 & - & - & 0.94 & - & - & - & 1.28 & - & - & 0.10 & - & - & - \\ \hline
04 & 0.95 & - & - & 0.94 & - & - & - & 1.16 & - & - & -0.83 & - & - & - \\ \hline
05 & 0.97 & - & - & 0.96 & - & - & - & 0.50 & - & - & -1.03 & - & - & - \\ \hline
06 & 0.99 & - & - & 0.98 & - & - & - & 0.56 & - & - & 0.01 & - & - & - \\ \hline
07 & 0.98 & - & - & 0.98 & - & - & - & 0.32 & - & - & 0.11 & - & - & - \\ \hline
08 & 0.91 & - & - & 0.91 & - & - & - & 0.62 & - & - & 0.16 & - & - & - \\ \hline
09 & 0.59 & 0.91 & 0.41 & 0.61 & 0.94 & 0.27 & 0.93 & 1.31 & -0.50 & -11.2 & 1.01 & 1.64 & -6.32 & 2.53 \\ \hline
10 & 0.73 & 0.96 & 0.76 & 0.71 & 0.86 & 0.21 & 0.89 & 1.05 & -1.89 & -18.7 & 0.72 & 0.12 & -6.94 & 2.67 \\ \hline
11 & 0.65 & 0.98 & 0.84 & 0.62 & 0.95 & 0.43 & 0.97 & 1.76 & -0.95 & -13.9 & 1.12 & -0.79 & -6.17 & 1.88 \\ \hline
12 & 0.62 & 0.98 & 0.82 & 0.62 & 0.98 & 0.40 & 0.99 & 1.36 & -0.73 & -15.1 & 1.19 & 1.67 & -15.8 & 2.14 \\ \hline
13 & 0.61 & 0.98 & 0.94 & 0.58 & 0.98 & 0.83 & 0.73 & 0.75 & 7.83 & -2.37 & -3.85 & 8.34 & 4.44 & 6.70 \\ \hline
14 & 0.55 & 0.97 & 0.96 & 0.59 & 0.98 & 0.92 & 0.97 & 0.23 & 7.91 & 3.11 & -4.83 & 8.43 & 5.80 & 6.57 \\ \hline
15 & 0.59 & 0.99 & 0.86 & 0.50 & 0.99 & 0.77 & 1.00 & 2.94 & 5.32 & 0.41 & 4.50 & 7.84 & 2.01 & -1.20 \\ \hline
17 & 0.67 & 0.98 & 0.98 & 0.64 & 0.99 & 0.91 & 0.88 & 1.22 & 4.06 & 3.66 & 7.33 & 5.23 & 4.29 & -8.75 \\ \hline
18 & 0.95 & - & - & - & - & - & - & 1.22 & - & - & - & - & - & - \\ \hline
19 & 0.97 & - & - & - & - & - & - & 0.46 & - & - & - & - & - & - \\ \hline
20 & 0.97 & - & - & - & - & - & - & 0.60 & - & - & - & - & - & - \\ \hline
21 & 0.99 & - & - & - & - & - & - & 0.34 & - & - & - & - & - & - \\ \hline
22 & 0.99 & - & - & - & - & - & - & 0.64 & - & - & - & - & - & - \\ \hline
23 & 0.99 & - & - & - & - & - & - & 0.10 & - & - & - & - & - & - \\ \hline
24 & 0.99 & - & - & - & - & - & - & 0.59 & - & - & - & - & - & - \\ \hline
25 & 0.99 & - & - & - & - & - & - & 0.10 & - & - & - & - & - & - \\ \hline
26 & 0.99 & - & - & - & - & - & - & 0.35 & - & - & - & - & - & - \\ \hline
28 & 0.76 & 0.99 & 0.82 & - & - & - & - & 0.47 & 6.64 & -1.22 & - & - & - & - \\ \hline
30 & 0.80 & 0.99 & 0.99 & - & - & - & - & -0.49 & 7.97 & 9.97 & - & - & - & - \\ \hline
31 & 0.88 & 0.99 & 0.97 & - & - & - & - & 1.64 & 5.23 & -3.38 & - & - & - & - \\ \hline
32 & 0.92 & 1.00 & 0.99 & - & - & - & - & 0.65 & 4.79 & -0.18 & - & - & - & - \\ \hline
33 & 0.97 & 1.00 & 0.88 & - & - & - & - & 0.89 & -0.83 & -16.9 & - & - & - & - \\ \hline
34 & 0.94 & 0.99 & 0.89 & - & - & - & - & 1.67 & -2.62 & -15.4 & - & - & - & - \\ \hline
35 & 0.57 & 1.00 & 0.92 & - & - & - & - & 1.40 & -2.82 & -12.9 & - & - & - & - \\ \hline
36 & 0.95 & 1.00 & 0.95 & - & - & - & - & 0.47 & -0.70 & -13.0 & - & - & - & - \\ \hline
37 & 0.98 & 1.00 & 0.98 & - & - & - & - & 0.39 & -1.13 & -9.59 & - & - & - & - \\ \hline
38 & 0.99 & 1.00 & 0.98 & - & - & - & - & 0.70 & -0.35 & -9.37 & - & - & - & - \\ \hline
39 & 0.93 & 1.00 & 0.98 & - & - & - & - & 0.64 & -0.74 & -2.89 & - & - & - & - \\ \hline
40 & 0.98 & 1.00 & 0.99 & - & - & - & - & 0.29 & -0.75 & -4.23 & - & - & - & - \\ \hline
41 & 0.90 & 1.00 & 0.97 & - & - & - & - & 0.48 & 0.83 & -9.68 & - & - & - & - \\ \hline
42 & 0.95 & 1.00 & 0.99 & - & - & - & - & 0.54 & 1.14 & -4.27 & - & - & - & - \\ \hline
43 & 0.91 & 1.00 & 0.96 & - & - & - & - & 1.83 & -4.63 & -13.6 & - & - & - & - \\ \hline
44 & 0.90 & 1.00 & 0.93 & - & - & - & - & 0.58 & -2.60 & -8.68 & - & - & - & - \\ \hline
45 & 0.94 & 1.00 & 0.98 & - & - & - & - & 2.00 & -4.73 & -9.07 & - & - & - & - \\ \hline
46 & 0.95 & 1.00 & 0.98 & - & - & - & - & 1.70 & -4.29 & -7.23 & - & - & - & - \\ \hline
\caption{R-values and offset values of all tests performed}
\label{Rvalues_all}
\end{longtable}
\end{footnotesize}
\end{document}