题目内容

在定义下拉列表时，标签用于定义选项组，必须嵌套在标签中。()

A. 对
B. 错

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readonly属性只适用于标签。()

A. 对
B. 错

表单控件应用了readonly属性后，不能进行编辑和修改。()

A. 对
B. 错

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