一个DIV的外边距要求为：“上边距：2Opx、下边距：30px、左边距：40px、右边距：50px”，能够正确设置该样式的CSS语句是（ ）。
- A.margin:20px 30px 40px 50px
- B.padding:20px 30px 40px 50px
- C.margin:20px 50px 30px 40px
- D.padding:20px 50px 30px 40px
正确答案及解析
正确答案
解析
本题考查CSS的盒子模型的知识。
设置外边距的最简单的方法就是使用margin属性；h1{margin：10px 0px 15px 5px；}这些值的顺序是从上外边距（top）开始围着元素顺时针旋转的，顺序为上右下左。
经过分析，本题选C（A选项顺序错误，外边距属性值应该为上右下左，而在选项内显示的确是上下左右；B选项属性和顺序皆错误，padding代表内间距，顺序是上右下左；D选项属性错误，padding代表内间距）。
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