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d.innerHTML = d.innerHTML + '<a class=\"download_word download_word_lb\" href=\"javascript:;\" id=\"vipdown\" onclick=\"showpay(1)\"><em></em>下载文档(未登录)液晶显示器背光类型及优缺点（LCD、CCFL、LED）描述：液晶背光显示原理 液晶不同于等离子的最大区别就是液晶必须依靠被动光源，而等离子电视属于主动发光显示设备。目前市场上主流的液晶背光技术包括LED(发光二极管)和CCFL(冷阴极荧光灯)两类。冷阴极荧光灯管（Cold Cathode Fluo</a>';
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