一個知識點,你在哪道題上遇到問題了,說明你的這個知識掌握的還是不好,我再幫你鞏固。等你把這些題全部做完,我再找一些難一點的題給你。&rdo;
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dia (-width:800px) { banners6 { width: 728px; height: 90px; } }
dia (-width:1280px) { banners6 { width: 970px; height: 250px; } }
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