Select选择多行
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select标签中的 multiple="multiple"表示允许多选，size=“5”表示显示5行<br>
<SELECT NAME="toppings" multiple="multiple" SIZE="5">
<OPTION VALUE="mushrooms">mushrooms</OPTION>
<OPTION VALUE="greenpeppers" selected="selected">green peppers</OPTION>
<OPTION VALUE="onions" selected="selected">onions</OPTION>
<OPTION VALUE="tomatoes">tomatoes</OPTION>
<OPTION VALUE="olives">olives</OPTION>
</SELECT>
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