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длительность интервала stresses
comp.	interval length
math.	interval size
media.	deenergized period length

длительность интервала: 27 phrases in 13 subjects

Applied mathematics	1
Automated equipment	1
Cardiology	1
Communications	1
Economy	2
Electronics	1
Mass media	5
Medical appliances	1
Military	1
Quality control and standards	1
Radio	8
Technology	3
Telecommunications	1