什么是可视图文 可视图文(Videotex)是面向电话网上用户的交互式信息服务新业务,它是一种开放式的信息检索型系统,规定了一套统一的屏幕显示格式检索方法,还提供了一套公用通信系统,数据库一旦接入这个网络,它就可以向网上的所有用户提供服务;用户一旦接入此系统就可以获得网上所有数据库中的信息。可视图文的突出优点是用户使用简单,格式统一,可以实现信息资源共享。 在我国,由邮电部门经营、管理的可视图文业务是全国性信息服务系统。它利用中国公用分组交换数据网,把分布在全国各地的公用数据库和专用数据库组织起来,向用户提供检索型、交易型、计算和信息处理型业务,用户可以通过电话网使用可视图文业务。邮电部门经营的可 What is Videotex Videotex is a new service for interactive information services for users of telephone networks. It is an open information retrieval system that provides a uniform set of retrieval methods for screen display formats, It also provides a public communications system, which, once accessed by the database, provides services to all users on the Web; once accessed, users can access information from all databases on the Web. The obvious advantages of visual graphics is that users are easy to use, the format is uniform, and information resources can be shared. In our country, the visual teletext business operated and managed by the post and telecommunications departments is a national information service system. It uses China’s public packet-switched data network to organize public databases and dedicated databases distributed across the country to provide users with search, transaction, computing and information processing services that enable users to use the videotex services over the telephone network . Post and telecommunications departments can operate