Asageneralrule,supplementoxygenshouldbeprovidedandusedbythepilotinthedayiftheflightisabove（）
A. 15,000feet
B. 10,000feet
C. 8,000feet
Thecomponentofbloodwhichismostdirectlyinvolvedinthetransportofoxygenthroughoutthebodyis（）
A. theredbloodcells
B. theplasma
C. hemoglobin
Whatcauseshypoxia?（）
A. Excessivecarbondioxideintheatmosphere.
B. Anincreaseinnitrogencontentoftheairathighaltitudes.
C. Adecreaseofoxygenpartialpressure.
Whatisasymptomofcarbonmonoxidepoisoning?（）
A. Rapid,shallowbreathing.
B. Painandcrampingofthehandsandfeet.
C. Dizziness.
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