latex表格的首行和内容无法对对齐的情况

先写在这里,之后再补充吧,截图实在不方便;

\begin{table}[htb]\scriptsize
\centering
\begin{tabular}{ llrrr}
\toprule \textbf{No.}& \textbf{Data Set}& \textbf{Instance} & \textbf{Attribute } & \textbf{Class} \
\midrule
1&Post-operative&90&8&3\
2&Zoo&101&16&7\
3&Echocardiogram&131&6&2\
4&Lymphography&148&18&4\
%5&Wine&178&13&3\
5&Glass-id&214&9&3\
%7&New-thyroid&215&5&3\
6&Audio&226&69&24\
7&Heart-disease-c&303&13&2\
8&Primary-tumor&339&17&22\
9&Dermatology&366&34&6\
10&Chess&551 &39&2 \
11&Balance-scale&625&4&3\
12&Soybean&683&35&19\
13&Credit-a&690&15&2\
14&Vehicle&846&18&4\
15&Anneal&898 &38&6 \
16&Vowel&990 &13&11 \
17&Led&1000&7&10\
18&German&1000&20&2\
19&Car&1728&6&4\
20&Segment&2310&19&7\
21&Hypothyroid& 3163& 25 &2\
%22&Kr-vs-kp&3196&36&2\
22& Abalone& 4177& 8& 3\
23&Wall-following&5456&24&4\
24&Phoneme& 5438& 7 &50\
25&Page-blocks&5473&10 &5\
26&Optdigits &5620& 64 &10\
27&Mushrooms&8124&22&2\
28&Thyroid &9169&29&20\
29&Sign &12546& 8& 3\
30& Nursery &12960& 8& 5\
31&Magic& 19020& 10& 2\
32& Letter-recog & 20000& 16& 26\
33& Adult & 48842& 14& 2\
34&Connect-4 & 67557& 42& 3\
35&Waveform& 100000& 21& 3\
36& Localization & 164860& 5 &11\
37&Census-income& 299285 & 41& 2\
38&Poker-hand& 1025010 & 10& 10\
\bottomrule
\end{tabular}
\caption{Details of Data sets}
\label{Tab_Details_Of_Data_Sets}
\end{table}

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