理学 数据库系统 释 relational database 关系数据库 采用关系模型的数据库。 理学 云计算 释 relational database 关系数据库 采用关系模型（relational model）来组织数据的数字数据库，一种可以存储数据，也可以选择性进行功能实现的永久性存储机制。
数据库 数据库管理系统及其实现技术 释文 relational database 关系数据库
- directional explosive echo ranging
- directional filter banks
- directional fragmentation warhead
- directional gamma-ray radiometer
- directional gene knock-out (editing) on aquatic animal
- directionality
- directionality in translation
- directional light source
- directional limit
- directionally intersected wells
- directionally solidified columnar superalloy
- directionally solidified eutectic superalloy
- directionally solidified superalloy
- directional machine
- directional mutation
- directional partial derivative
- directional pattern
- directional pattern of microphone
- directional pinpoint blasting
- directional power protection
- directional quantization
- directional reflectomography
- directional selection
- directional selectivity
- directional sensor network