使用CSS设置文字、排版、边界等样式时，经常用到长度单位，下列是相对单位的是（ ）。
- A.in
- B.cm
- C.px
- D.pt
正确答案及解析
正确答案
解析
本题考查CSS的属性值。
CSS表示长度属性值分为两类：相对单位和绝对单位。
绝对单位就是固定的，有厘米（cm）、英寸（in）、英镑（pt）、pica（皮卡）等。
相对单位是相对的，设置的对象取决于分辨率、浏览器设置，以及其他相关因素，对应的单位包括：em、ex、px、%
综合分析，本题选C。
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