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ультранизкая частотаstresses
energ.ind. very low frequency
Gruzovik, radio ULF 300-3000 Hz (ultra-low frequency)
med. extremely low frequency (электрического тока); ultralow frequency (3÷30 кГц)
mil., avia. ultralow frequency
tech. ultra-low frequency
ультранизкая частота: 1 phrase in 1 subject
Makarov1