Question 609, Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license

The Oxygen Masks Are Automatically Presented To Flight Crew Members
The oxygen masks are automatically presented to cabin crew members and passengers
Manual override of the automatic presentation of passenger oxygen masks is, generally speaking, not possible
If The Automatic Mask Presentation Has Been Activated, The Oxygen Will Flow Within The First 3 Minutes