On passenger planes, oxygen masks are an emergency life-saving device to provide oxygen to passengers. In case of sudden loss of air tightness or other lack of oxygen in the cabin, passengers can get an oxygen mask to replenish oxygen at any time. When the plane reaches a certain altitude, the cabin must be pressurized. If the aircraft cabin pressure loss, will cause oxygen deprivation, passengers in the case of oxygen will be dizzy, unconscious, and life-threatening. In the case of cabin pressure loss at different heights, the time of hypoxia can be tolerated is different. The higher you fly, the less time it takes. In the civil aviation passenger plane, each person's seat is equipped with the personal oxygen mask used in emergency, so there is no need to fight, lest the oxygen mask is damaged and delay the use.
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