题目内容

Apilotwasfoundbreathingquicklyanddizzyinflight,andhisfingertipsbecameblue,whatmayhappen?（）

A. Hyperventilation
B. Hypoxia
CarbonMonoxide

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Hypoxiais（）

A. alwayseasytoperceive.
B. easytoovercome.
C. ofinvisibility.

Flyingwhilesufferingfromaheadcoldincreasestheriskof（）

A. hypoxia
B. decompressionsickness
C. barometeorism高空胃肠胀气

Theheartrateofahealthyadultinquietenvironmentisabout（）

A. 80-150times/min
B. 50-80times/min
C. 60-100times/min

Duringflight,middleearbarotraumasoccursmainlywhen（）

A. flyingbelow1000m.
B. flyingabove6000m.
C. flyingbelow4000m.