frequency jump频率跃变frequencyn.频繁；频率frequency conversion reconstruction for energy-saving变频节能改造Frequency-dependent varying-step depth extrapolation频率相关变步长深度延拓frequency corresponding method of precipitation-runoff降水径流频率相应法frequency-shifted and re-scaling stochastic resonance移频变尺度随机共振frequency-characteristic measuring-testing instrument频率特性测试仪frequency modulation-frequency division multiple access调频-频分多址联接frequency-oscilated trapping and controlling techniques频振诱控技术frequency-conversion and speed-adjusting water supply变频调速供水Frequency Linearization of Voltage-Controlled Oscillator压控振荡器频率的线性化frequency-conversional multi-connected air-conditioning system变频多联机