题目内容

Flyingwhilesufferingfromaheadcoldincreasestheriskof（）

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

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Theheartrateofahealthyadultinquietenvironmentisabout（）

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

Duringflight,middleearbarotraumasoccursmainlywhen（）

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

Howtopreventandovercomemiddleearbarotraumas?（）

A. Putonheadphones.
B. TakeinasmallbagofCO2、
C. Movethesoftpalateormakeswallowingmotion.

Whichfactormaybeassociatedwithgrayout?（）

A. positive-G
B. negative-G
C. 0-G