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题目 40-2

css
.box1 {
    width: 100px;
    height: 100px;
    background-repeat: no-repeat;
    background-size: 100% 100%;
    background: url('./images/head.png');
}
.box1 {
    width: 100px;
    height: 100px;
    background-repeat: no-repeat;
    background-size: 100% 100%;
    background: url('./images/head.png');
}

题目:通过阅读上方代码,请描述它要实现什么效果,以及存在什么问题?

答题文件: 40-2.md

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