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   Russian
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сверхнизкая частотаstresses
astronaut. ultra-basse fréquence (СНЧ)
mil. extrêmement basse fréquence
mil., engl. extremely low frequency; very low frequency
radio fréquence ultra-basse; ultra-basse fréquence
 Russian thesaurus
сверхнизкая частота
abbr., radio СНЧ