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упругая ось stresses
astronaut.	elastic axis
avia.	axis of twist
brit.	flexural axis
Makarov.	elastic axis (балки); elastic deflection curve; elastic line (балки); elastic line axis; line of deflection (балки)
mil., arm.veh.	elastic axle
tech.	elastic line

упругая ось: 3 phrases in 3 subjects

Bridge construction	1
Makarov	1
Nautical	1