frequency rate调频率frequencyn.频繁；频率frequency converter speed regulation变频调速frequency calibrated recording paper频率校准记录纸Frequency Resource Management System频率资源管理系统Frequency Hopping Spread Spectrum LT不透水型电机frequency divider with no limitation任意分频器frequency scintillation oscilloscope频显示波器Frequency-varying adjust technique变频调速系统frequency characteristic measurement频率特性测量frequency control speed-regulating变频调速frequency-modulation predistortion调频预失真