frequencyn.频繁;频率
frequency synthesizer with high stability高稳定性频率源
frequency conversion and speed regulating调频变速
Frequency selectivity of resonant circuit共振电路的频率选择性
Frequency Conversion Transforming Oil Rig石油钻机的变频改造
frequency-dependent negative resistance频率相关负电阻, 随频率而变的负电阻
frequency-domain model reduction method频域模型降阶法
frequency conversion and speed modulation变频调速
frequency conversion and speed adjustment变频调速