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перемещение вперёд-назад (ssn) | |||
возвратно-поступательное движение (When the air is supplied to the internal cylinder of the actuator, the Piston makes back-and-forth movement and this movement makes those valves and dampers move accordingly. Александр Рыжов) |
back-and-forth movement : 1 phrase in 1 subject |
Aerohydrodynamics | 1 |