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эквивалентный четырёхполюсник stresses
el.	equivalent four-terminal pole network; two-port equivalent
electr.eng.	equivalent two-port
Makarov.	equivalent quadripole
tech.	equivalent network; equivalent four-pole network; equivalent four-terminal network; equivalent quadripole network; equivalent two-port network

эквивалентный четырёхполюсник: 3 phrases in 2 subjects

Electronics	2
Mass media	1