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    <title>作业题04</title>
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<h3>虾米大王填写的作业题04</h3>
<h4>一、填空题</h4>
<p>1. 变量必须以<input type="text" value="$">符号开头,第二个字符必须是<input type="text"value="字母">
    或<input type="text" value="下划线">。</p>
<p>2. 销毁一个变量有两种方法:一种是<input type="text" value="unset()">,另一种是<input type="text" value="=null">。</p>
<h4>二、选择题</h4>
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    <p>1. 下面程序的运行结果是( )</p>
    <p>&lt;?php</p>
    <P>$a = 5;</P>
    <p>$b = 3;</p>
    <p>echo $a/$b%$b."&ltbr&gt";</p>
    <p>?&gt;</p>
    <ol type="A">
        <li><input type="radio" name="title_1" checked="checked">1</li>
        <li><input type="radio" name="title_1">0</li>
        <li><input type="radio" name="title_1">1.7</li>
        <li><input type="radio" name="title_1">无输出</li>
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