frequency plot频率相位,特性曲线frequencyn.频繁；频率frequency-dependent effect频率依赖效应frequency-modulation laser调频激光器frequency-charging circuit频率变换电路frequencymodulated cyclotron同步回旋加速器Frequency division duplexing频分双工frequency conversation power变频电源frequency content parameters频谱周期参数frequency and speed changing变频调速frequency division data link分频数据联接frequency update data-rate频率更新数据率