frequency plan频率计划frequencyn.频繁；频率frequency conversion compressor变频压缩机frequency theory of probability概率的频率论frequency divisional processing分频处理frequency-yiversity reception[电] 频率分集接收frequency stability measurement频率稳定度测量frequency-doubling scattering倍频散射frequency-independent fitness与频率无关适合度, 频率独立适合度Frequency-dependent impedance频变阻抗frequency-modulated cyclotron调频回旋加速器frequency conversion renovation变频改造