管理学 电子政务网络技术 释 integrated services digital network; ISDN 综合业务数字网 实现话音、数据和图像在同一个网络中传输与交换的重要技术，是一种典型的电路交换网络系统。
网络与数据通信 协议体系与组成结构 释文 integrated service digital network, ISDN 综合业务数字网
- National Public Security Work Conference in the New Era
- National Publishing Committee
- National Radio and Television Administration
- national radio and television editor and reporter, announcer and host qualification examination
- National Radio Astronomy Observatory
- National Radio,Film and television Academic Paper Award
- National Radio, Film and Television Academic Works Award
- National Railway Administration of The People's Republic of China
- National Railway Museum
- National Rainbow Coalition
- National Rally of Independents
- national reading rate
- National Reconciliation Week
- National Recovery Administration，NRA
- national recreational sports
- national reputation
- National Research and Development Agency Public Works Research Institute
- National Research Center for Certified Reference Materials
- National Research Center for Sustainable Hydropower Development
- National Research Institute of Cultural Heritage
- National Research Institute of Science and Technology for Environment and Agriculture
- National Research University-Higher School of Economics
- National Resistance Movement
- National Revolutionary Army
- National Revolutionary Movement