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подтональная частотаstresses
el. subaudio frequency
media. sub-audio frequency (ниже диапазона 0,3-3,4 кГц)
tech. infrasonic frequency; subtelephone frequency; subsonic frequency
telegr. sub-telephone frequency
подтональная частота: 10 phrases in 5 subjects
Communications1
Computer networks1
Makarov2
Mass media4
Technology2