Carrier Ferquency Range 频率范围

ferquency relay 频率电驿

change speed by ferquency 变频调速

Ferquency Response 频率响应 ; 频率特性

Ferquency Selective Damping 动软硬可调式减震系统

ferquency graph 谱线图

adjust low pass crossover ferquency 调整低通交叉频

radio-ferquency abla-tion 消融治疗

limiting ferquency cutoff frequency 临界频率