Oneoftheeffectsofhypoxiaisadegradationofnightvision.Thiseffectbeginsatabout（）
A. 5,000feet
B. 10,000feet
C. 8,000feet
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Lossofcabinpressuremayresultinhypoxiabecauseascabinaltitudeincreases（）
A. thepercentageofnitrogenintheairisincreased.
B. oxygenpartialpressureisdecreased.
C. thepercentageofoxygenintheairisdecreased.
Whichisacommonsymptomofhyperventilation?（）
A. Tinglingofthehands,legs,andfeet.
B. Increasedvisionkeenness.
C. Decreasedbreathingrate.
Whichwouldmostlikelyresultinhyperventilation?（）
Astressfulsituationcausinganxiety.
B. Theexcessiveconsumptionofalcohol.
C. Anextremelyslowrateofbreathingandinsufficientoxygen.
Thesymptomsofhyperventilationare（）
A. quitedifferenttothoseofhypoxia
B. quitesimilartothoseofhypoxia
C. profusesweating
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