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
- scheme tender
- scheme-theoretic
- scheme-theoretical
- scheme保单调差分格式
- Schengen Area
- Schering bridge
- Scherk
- Scherk minimal surface
- Scherk surface
- scherzo
- Scheuchzer
- Scheuer-Readhead hypothesis
- SCHF approximation
- Schiaparelli crater
- Schiaparelli，Giovanni Virginio
- Schickard
- schiefspiegler telescope
- Schiff base
- Schiffer
- Schilder theorem
- Schiller crater
- Schiller On Acting
- Schilt photometer
- schima superba
- Schimidt