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div.img.img1{width:92.7rem;height:44.4rem;background-position:-186.5rem -.3rem}div.frame.chapter-4 .content div.img.img2{width:92.4rem;height:42.3rem;background-position:-186.6rem -46.1rem}body[lang=en] div.frame.chapter-4 h1{font-size:4.2rem}div.frame.chapter-5 .content div.themes{height:100rem;margin-bottom:12rem;display:block;position:relative}div.frame.chapter-5 .content div.themes div.img{width:92.3rem;height:44.1rem;position:absolute;background-color:#fff}div.frame.chapter-5 .content div.themes div.the1{background-position:0 -133.3rem;z-index:1}div.frame.chapter-5 .content div.themes div.the2{background-position:0 -89.2rem;z-index:2}div.frame.chapter-5 .content div.themes div.the3{background-position:-93.3rem -45.2rem;z-index:3}div.frame.chapter-5 .content div.themes div.the4{background-position:-93.3rem -89.3rem;z-index:4}div.frame.chapter-5 .content div.themes div.the5{background-position:-93.1rem -133.8rem;z-index:5}div.frame.chapter-5 .content div.themes div.the6{background-position:-.1rem -45rem;z-index:6}div.frame.chapter-6 .content .img{border:none}div.frame.chapter-6 .content .mysql{background-position:-188rem -104.3rem;width:26rem;height:13rem;margin:6rem 0 0 10rem}div.frame.chapter-6 .content .oracle{background-position:-213rem -104.3rem;width:27rem;height:13rem;margin:9rem 0 0 20rem}div.frame.chapter-6 .content .mssql{background-position:-243rem -104.3rem;width:32rem;height:13rem;margin:12rem 0 0 30rem}div.frame.chapter-6 .content .pgsql{background-image:url('https://assets.wuyuan.io/enhancer/site-assets/2.2.0/zh-cn/img/postgresql-logo3.png');background-size:32rem 8.3rem;background-repeat:no-repeat;width:32rem;height:8.3rem;margin:15rem 0 0 40rem}div.frame.chapter-6 .content .dameng{background-image:url('https://assets.wuyuan.io/common-template/img/all/logo/dameng-logo.png');background-size:100%;background-repeat:no-repeat;width:38rem;height:13rem;margin-left:24.5rem;margin-top:9rem}div.frame.chapter-6 .content 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