题目内容

Ariseincarbondioxideconcentrationinthebloodcause（）

A. areductioninrespirationrate
B. anincreaseinrespirationrate
C. areductioninbloodpressure

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Ifwhilstflyingat30,000ft,theaircraftsuddenlydepressurizes,themostcommonsymptomexperiencedbyallpersonsonboardwouldbe（）

A. Suddenexhalation
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A. Deploypassengeroxygenmask
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A. Gut
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A. 40seconds
B. 3minutes
C. 1minuteand15seconds