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
- dictionary search
- dictionary search interface
- dictionary settings
- Dictionary Society of North America
- dictionary type
- dictionary typesetting and printing
- Dictionary Typology
- dictionary with ready reference
- dictionary writing system
- dictyostele
- dicumarol
- dicyclic
- dicyclic design
- dicyclic group
- dicyclobutene
- dicyclohexylcarbodiimide
- dicyclohexylcarbodiimide (DCC)
- dicyclopentadiene
- dicyclopentadienyl beryllium
- dicyclopentadienyl chromium
- dicyclopentadienyl iron
- dicyclopentadienyl lead
- dicyclopentadienyl nickel
- dicyclopentadienyl ruthenium
- dicynodonts