工学 【复用概念】 释 synchronous digital hierarchy，SDH 同步数字体系 基于同步复用技术的数字复用体系。
网络与数据通信 协议体系与组成结构 释文 synchronous digital hierarchy, SDH 同步数字体系
- industrial explosives
- industrial field bus
- industrial finance
- industrial fire protection & explosion prevention
- industrial furnace
- industrial gas furnace
- industrial gasoline
- industrial geography
- industrial glass liquid thermometer
- industrial goods
- industrial grade
- industrial gradient transfer theory
- industrial green space
- industrial hemp
- industrial heritage
- industrial high-power microscope
- industrial housing
- industrial influencing result
- industrial information service
- industrial infrastructure
- industrial injury insurance dispute
- industrial injury insurance fund
- industrial injury insurance rate
- industrial injury insurance reserve
- industrial injury prevention