题目内容

Howtopreventandovercomemiddleearbarotraumas?（）

A. Putonheadphones.
B. TakeinasmallbagofCO2、
C. Movethesoftpalateormakeswallowingmotion.

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A. positive-G
B. negative-G
C. 0-G

A. Temperatureandhumidityinanairplane.
B. Flighttime,flightheightandthespaceexposedtothesun.
C. Airspeedandatmosphereconcentration.

A. 40%-60%
B. 50%-60%
C. 30%-60%

A. beinhypoxiastate.
B. sufferhyperventilation.
C. betooexcitedbecauseofhappythings.