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<!DOCTYPE html> <html> <body> <h2>可见的选项值</h2> <p>使用 size 属性指定可见值的数量。</p> <form action="/action_page.php"> <label for="cars">选择一辆车：</label> <select id="cars" name="cars" size="3"> <option value="volvo">Volvo</option> <option value="saab">Saab</option> <option value="fiat">Fiat</option> <option value="audi">Audi</option> </select><br><br> <input type="submit"> </form> </body> </html>