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
- background fog
- background galaxy
- background galaxy cluster
- background glow
- backgrounding
- background intensity
- background investigation
- background limited detectivity
- background mass spectrum
- background mathematics
- background mode
- background monitoring
- background music
- background noise
- background-noise level
- background optical and electromagnetic characteristic
- background projection process
- background radiation
- background radiation intensity
- background radio radiation
- background rejection
- background source
- background source function
- background star
- background subtraction