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the oxygen concentration can be reduced to 50 % by including 50 % nitrogen or approximately 60 % medical air.
la concentrazione d’ossigeno può essere ridotta al 50% includendo il 50% di nitrogeno o il 60% circa di aria medicale.
all air traffic controllers must periodically demonstrate medical fitness to satisfactorily execute their functions.
tutti i controllori del traffico aereo devono dimostrare l'idoneità medica a esercitare le loro funzioni in modo soddisfacente.