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периодические возмущения stresses
astr.	periodic perturbations; periodic inequalities
busin.	cyclical disturbances
electr.eng.	periodic disturbances
периодическое возмущение
astronaut.	periodic perturbation
Makarov.	periodical disturbance
math.	periodic disturbance
tech.	periodical perturbation
периодические возмущение
el.	periodic disturbances

периодические возмущения: 2 phrases in 2 subjects

Makarov	1
Mass media	1