题目内容

Thetimeofusefulconsciousnesswhilecruisingatanaltitudeof30,000feetandsittingquietlywouldbeabout（）

A. 40seconds
B. 3minutes
C. 1minuteand15seconds

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Theaveragetimeofusefulconsciousnesswhenengagedinmoderateactivityfollowingarapiddecompressionat30,000feetisclosestto（）

A. 25seconds
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