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hélice de palas orientables
mech.eng., el.	adjustable pitch propeller; variable pitch rotor
tech.	controllable-pitch propeller; feathering propeller
transp.	reversible-pitch propeller
transp., mech.eng.	reversible propeller

hélice de palas orientables: 4 phrases in 3 subjects

Earth sciences	1
Energy industry	1
Mechanic engineering	2