frequencyn.频繁;频率
frequency distortion transmission impairment频率失真传输减损
frequency modulation/amplitude modulation调频/调幅
frequency-conversing and speed-governing变频调速
frequency-domain lowpass filtering methods频率域低通滤波法
frequency crucible induction melting furnace频率坩埚感应熔炼炉
frequency odulation telecommunication system调频通信制
frequency monitoring and interference control频率监测和干扰控制
frequency-programmed microwave spectrometer频率程序控制微波光谱仪