low voltage-low frequency break apparatus
break angular frequency
break-point frequency method
three-phase break up and rise-frequency rise-volta
three-phase break up and rise-frequency rise-voltage synchronization method
carrier frequency channel break
break-break-make contact
Middle frequency-frequency convertor
break-make-break contact
audio frequency and video frequency processing
Belgium OSB double frequency(work-intermediate frequency) Queching machine
correlation in frequency domain and frequency domain
cyclic frequency-spectrum frequency domain
deteeting the ground point with low frequency electric current signal changing its frequency
double frequency(low intermediate frequency) Queching machine
flashing frequency， critical flicker frequency
FMVFT Frequency Modulated Voice Frequency Telegraph