题目内容

如下图,对于一个简单的调查表单,说法正确的是()

A. 表单的元素必须使用2个以上
B. 图中投票按钮不是一个表单元素
C. 调查表单只能使用单选按钮
D. 调查结果如需要保存到数据库中,需要建立一个数据库链接

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