理学 数据库系统设计 释 semantic data model 语义数据模型 一种基于高层语义的数据库描述和结构形式，是具有较强的语义功能的模型。
数据库 数据库应用开发 释文 semantic data model 语义数据模型
- satellite astronomy
- satellite attitude determination
- satellite autonomous integrity monitoring
- satellite balloon
- satellite based augmentation system
- satellite-based augmentation system
- satellite based differential positioning
- satellite based differential positioning system
- satellite-based entanglement distribution
- satellite-based gravity field model
- satellite-based train control system
- satellite borne atomic clock
- satellite-borne infrared radiometer
- satellite borne instrument
- satellite-borne sensor
- satellite-borne telescope
- satellite broadcasting and TV transmission networks
- satellite bus
- satellite camera
- satellite camera with quadraxial mounting
- satellite camera with quadraxial tracking frame
- satellite cell
- satellite cells
- satellite chromosome
- satellite city