题目内容

如果想要定义单选按钮默认选中效果,可以使用()属性来实现

A. type
B. selected
C. checked
D. name

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A. required
B. formvalidate
C. validate
D. placeholder

A. background-size
B. background-repeat
C. background-image
D. background-position

A. linear-gradient
B. radial-gradient
C. repeating-gradient
D. no-repeat

A. border:2px solid red;
B. border-bottom:2px solid red;
C. border-style:2px solid red;
D. border-color:2px solid red;