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собственный период stresses
met.	natural period (колебани)
phys.	natural period
polym.	natural period (колебаний)
seism.	eigen period

собственный период: 49 phrases in 25 subjects

Acoustics	1
Astronautics	1
Automobiles	1
Combustion gas turbines	1
Construction	1
Economy	1
Electronics	1
Energy system	1
Geophysics	5
Hydrology	1
Makarov	6
Mass media	1
Medical	1
Metrology	1
Military	1
Mining	4
Nautical	9
Oil / petroleum	1
Oil and gas	2
Programming	1
Road works	1
Sakhalin	1
Seismology	1
Shipbuilding	1
Technology	4