随着社会进步和经济发展,信息对决策愈来愈显得重要,抓准了信息,就抓住了机遇;抓准了信息,就抓住了效益。因之,现代信息服务业——可视图文便应运而生。 可视图文系统是一种公用的开放式信息服务系统。它利用现有的公用电话网和分组交换网把信息库资源组织起来,利用电话网向 With the progress of society and economic development, the decision-making of information becomes more and more important. Grasping the information, we seize the opportunity. When grasping the information, we grasp the benefit. Therefore, the modern information service industry - the visualization of the article came into being. Visual graphic system is a public open information service system. It uses the existing public telephone network and packet-switched network to organize the resources of the information base, using the telephone network to