frequency trim频率微调frequencyn.频繁；频率frequency conversion power supply变频电源frequency domain volume rendering频域体绘制frequency modulation spectroscopy频率调制频谱学frequency-to-number converter[计] 频率-数字变换器frequency characteristic function频率特性frequency multiplication sampling倍频采样frequency controlled water supply变频调速给水Frequency Hopping Processing Gainfrequency selective MIMO channels频率选择性MIMO信道frequency reuse satellite network频率再用卫星网络