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промышленная частотаstresses
el. 市电频率; 工业用电频率; 电网频率
tech. 工业频率; 工频; 电源频率; 工业频率市电频率
промышленная частота: 43 phrases in 6 subjects
Electrical engineering2
Electronics16
General17
Information technology1
Oil processing plants3
Technology4