A. 80-150times/min B. 50-80times/min C. 60-100times/min
A. flyingbelow1000m. B. flyingabove6000m. C. flyingbelow4000m.
A. Putonheadphones. B. TakeinasmallbagofCO2、 C. Movethesoftpalateormakeswallowingmotion.
A. positive-G B. negative-G C. 0-G
A. Temperatureandhumidityinanairplane. B. Flighttime,flightheightandthespaceexposedtothesun. C. Airspeedandatmosphereconcentration.
A. 40%-60% B. 50%-60% C. 30%-60%
A. beinhypoxiastate. B. sufferhyperventilation. C. betooexcitedbecauseofhappythings.
A. Heightenedawarenessandfeelingofwell-being. B. Decreasedbreathingrateanddepth. C. Symptomsofsuffocationanddrowsiness.
A. Drowsiness. B. Decreasedbreathingrate. C. Euphoriasenseofwell-being.
A. Insufficientcarbondioxide. B. Insufficientoxygen. C. Excessivecarbonmonoxide.
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