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
- utility graph
- utility management systems
- utility of periodicals
- utility pipeline
- utility problem
- utility program
- utility room/laundry room
- utility software
- utility systems integration
- utility theory
- utility theory for games
- utility tunnel
- Utility Tunnel Law
- utilizable regulation
- utilization and improvement of purplish soil
- utilization and reclamation of lime concretion black soils
- utilization coefficient
- utilization coefficient of irrigation water
- utilization coefficient of out driving time
- utilization degree of waterflooding reserve
- utilization efficiency of feed energy
- utilization landfill biogas
- utilization of agricultural biomass energy
- utilization of agricultural biomass energy sources
- utilization of agro-climatic resources