电子技术的飞速发展,使作为信息主要载体的纸张开始让位于电子媒体。与纸张相比,电子媒体利用计算机技术存储和处理信息,利用电信技术传递信息,它具有容量大、体积小、成本低、检索快,易于复制、保存和处理,以及音像图文并茂、消耗资源很少、对环境 The rapid development of electronic technology, as the main carrier of information paper began to give way in the electronic media. Compared with paper, electronic media uses computer technology to store and process information, and use telecom technology to transmit information. It has the advantages of large capacity, small size, low cost, quick retrieval, easy to copy, save and process, as well as audio- , On the environment