frequencyn.频繁;频率
frequency control of motor speed变频调速
frequency - selective channels频率选择性信道
frequency range expanding method频带扩展法
frequency-modulated audio tone调频音调
frequency-time coding of pulse脉冲频率时间编码
frequency response of microphone传声器频率响应
Frequency Resource Record System频率资源记录系统
frequency-modulated oscillator调频振荡器