frequency lead频率导引frequencyn.频繁；频率frequency -response characteristic频率响应特性frequency-converter resonance test变频谐振试验frequency modulation radio altimeter调频无线电测高计frequency -domain batch processing频域批处理frequency-modulated broadcast band调频广播波段Frequency-shifting Automatic Block移频自动闭塞frequency shift communication system移频通信系统frequency-varied regulation device变频调速装置Frequency band and spectrum analysis频带与频谱分析frequency-shared channel amplifier分频通道放大器