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256 - ATPL Question Bank in English - A typical vented continuous-flow passenger oxygen mask delivers which breathing mixture to the wearer?

Question 256 - Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot Licence

100% oxygen.
Oxygen mixed with refrigerant gas
A mixture of cabin air and oxygen.
Oxygen mixed only with compressed air from a separate external air supply, never cabin air

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