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## 問答題 1. 單行文字豎直居中和多行文字居中代碼怎么寫 2. 盒子模型由幾個部分組成 ## 編程題 1. HTML里面一個div布滿整個屏幕，給該div設置一個背景圖片布滿整個div且不平鋪 2. HTML里面一個div水平居中，該div中有個兩個img圖片，圖片之間間距為30px
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