Inphysiology,twophasesofbreathmeans（）
A. Theairexchangetakingplaceinlungandtheairexchangebetweenthebloodandthetissue
B. Theinhalingofoxygenandtheexhalingofcarbondioxide.
C. Thatthepilotshouldmaketwodeepbreatheswhenunderstrain.
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ThephenomenonofhypoxiacausedbypositiveGdominoeffectmaybecalled（）
Accelerationhypoxia
B. Anemichypoxia
Circulatingstagnationhypoxia
Whentheexhaustgasofcabinleadstoanemichypoxia,thenecessarymeasuresshouldbe（）
A. Deepbreathingimmediatelyandexercisingtheirhandsandfeet
B. Openingthefreshairinletandofferingoxygenintime
C. Speakingloudlytopreventconsciousnessfromdisappearing
Ifoxygenequipmentisnotused,thelimenaltitude（阈限高度）inducinghypoxichypoxiaformostpeopleis（）
A. 15000feet
B. 1000feet
C. 10000feet
Whyishypoxiaparticularlydangerousduringflightswithonepilot?（）
A. Thepilotmaynotbeabletocontroltheaircraftevenifusingoxygen.
B. Symptomsofhypoxiamaybedifficulttorecognizebeforethepilot'sreactionsareaffected.
C. Nightvisionmaybesoimpairedthatthepilotcannotseeotheraircraft.
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