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ultra low frequencystresses
media. сверхнизкая частота (частоты от 300 Гц до 3000 Гц)
ultra-low frequency
tech. ультранизкая частота
 English thesaurus
Ultra Low Frequency
abbr., astronaut., mil. ULF (less than 3 Hz)
abbr., scottish ULF
ultra- low frequency: 6 phrases in 5 subjects
Electrical engineering1
Makarov1
Medical1
Military2
Technology1