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<title>Mr问答平台</title>
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<h1>Mr问答系统</h1>
<h2>2017</h2>
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用户名:<input type="text" ><br>
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<input type="radio" value="stu">student
<input type="radio" value="tea">teacher
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<input type="checkbox" value="true">记住我 <a href="">登陆遇到问题</a><br>
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<ul>
<li>python</li>
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