差动差分放大器
differential difference current conveyor
改进型差动差分电流传送器
modified differential difference current conveyor
轻型移动式电动倒链
lightweight electric trolley chain hoist
（差动保护）
Better-than-average effect
差动咬入法
differential biting method
2K-H型差动轮系
2K-H differential gear trains
3级直线差动机构
three-level straight line differential mechanism
500 kV主变差动保护
differential protection far 500 kV main transforme
DFT差动保护
DFT differential protection
SEL-587比率差动
SEL-587 percentage restrained differential
被动差分吸收光谱
Passive differential optical absorption spectroscopy