sur un Oxygen and the air pressure are always being monitored. In the event of a lack of oxygen, an oxygen mask will automatically --(a)-- in front of you. Pull the mask towards you and --(b)--it firmly over your nose and mouth. Secure the elastic band behind your head, and breathe normally. If you are travelling with a child or someone who requires ---(C)--- secure your mask first, and then assist the other person. Keep your mask on until a uniformed crew member advises you to ---(d)--- In the event of an ---(e)--- please assume the bracing position.
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how this number in case you have a mask is the
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