理学 数据库系统设计 释 entity-relationship model 实体关系模型 通过客观事物及其联系进行形式化描述的数据模型。又称实体-联系模型、E-R模型。
数据库 数据库理论 释文 entity-relationship model 实体-联系模型
- two-phase lock, 2PL
- two-phase model
- two-phase relative permeability
- two phase sampling
- two-phase sampling
- two phases heat transfer
- two-phase simplex method
- two-phase Stefan problem
- two-phase structure
- two phase system
- two photon absorption
- two-photon absorption
- two-photon annihilation
- two photon coherent state
- two-photon coherent state
- two-photon detuning
- two-photon emission
- two-photon excitation microscopy
- two photon excited atomic fluorescence
- two-photon excited atomic fluorescence
- two-photon fluorescence
- two photon fluorescence microscope
- two-photon fluorescence microscope
- two-photon fluorescent probe
- two-photon Hong-Ou-Mandel interferometer