difference velocity field  差异速度场

difference velocity principle  差速原理

jet with velocity difference  速差射流

Modular Velocity Difference  模速差异

multiple velocity difference  多速度差

ratio of peripheral velocity difference  转速差率

velocity difference of two channels  双通道速度差

Analysis of difference of velocity  差速分析

difference interval velocity  差异层速度

average velocity， mean velocity  乐观的并发控制; 平均速度

group velocity and phase velocity  群速与相速

ratio of pulp velocity and sire velocity  浆网速比

velocity derived from velocity spectrum  速度谱速度

closed difference of height difference  高差闭合差

difference in difference  倍差法

difference in difference (DD) method  差异中之差异法

Difference-in-difference  双重差分模型

log mean temperature difference; logarithmic mean temperature difference  对数平均温差

logarithmic mean temperature difference; log mean temperature difference  对数平均温差