':'';
echo ($sort_key=='student_id' and $sort_order=='1')?'![]() |
':'';
echo ($sort_key=='student_serial' and $sort_order=='1')?'![]() |
':'';
echo ($sort_key=='student_class' and $sort_order=='1')?'![]() |
':'';
echo ($sort_key=='student_num' and $sort_order=='1')?'![]() |
':'';
echo ($sort_key=='student_sex' and $sort_order=='1')?'![]() |
':'';
echo ($sort_key=='student_name' and $sort_order=='1')?'![]() |
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