【机械工程】自由活塞发动机【机械工程】自由活塞发动机

free-piston pump

gas generator being of the free-piston type

compressed air engine, free-piston engine

steam engine, hydraulic engine,compressed gas engine, free-piston engine

free-piston gas turbine

free-piston machine or engine

free-piston combustion gas generator

free-piston engine