frequency plot频率相位,特性曲线frequencyn.频繁；频率frequency distribution curve频率分布曲线,频次分配曲线frequency conversion speeder变频调速装置frequency-selective fading频率选择性衰落Frequency-domain detection频域检测frequency division date link频率分割数据传输装置frequency conversion control变频控制frequency of bud-variation芽变频率Frequency distinguishability频率分辨率frequency converting circuit变频电路frequency-modulating laser调频激光器