Theheartrateofahealthyadultinquietenvironmentisabout（）
A. 80-150times/min
B. 50-80times/min
C. 60-100times/min
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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
Whichfactorsareassociatedwiththeincidenceofradiation?（）
A. Temperatureandhumidityinanairplane.
B. Flighttime,flightheightandthespaceexposedtothesun.
C. Airspeedandatmosphereconcentration.
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