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正确答案：B

(21)One of the effects of hypoxia is a degradation of night vision. This effect begins at about

? ? ?

A．5,000 feet B．10,000 feet C．8,000 feet

正确答案：A

(22)A passenger briefing by a crewmember shall be given, instructing passengers on the necessity of using oxygen in the event of cabin depressurization, prior to flight conducted above

? ? ?

A．FL200 B．FL240 C．FL250

正确答案：C

(23)Loss of cabin pressure may result in hypoxia because as cabin altitude increases

? ? ?

A．the percentage of nitrogen in the air is increased. B．oxygen partial pressure is decreased.

C．the percentage of oxygen in the air is decreased.

正确答案：B

(24)Which is a common symptom of hyperventilation?

? ? ?

A．Tingling of the hands, legs, and feet. B．Increased vision keenness. C．Decreased breathing rate.

正确答案：A

(25)Which would most likely result in hyperventilation?

? ? ?

A．A stressful situation causing anxiety. B．The excessive consumption of alcohol.

C．An extremely slow rate of breathing and insufficient oxygen.

正确答案：A

(26)The symptoms of hyperventilation are

? A．quite different to those of hypoxia ? B．quite similar to those of hypoxia ?

C．profuse sweating

正确答案：B

(27)A pilot showing the symptoms of dizziness, tingling at the fingertips

? A．Hypoxia ?

B．Hypertension

?

C．Hyperventilation

正确答案：C

(28)A rise in carbon dioxide concentration in the blood cause

? ? ?

A．a reduction in respiration rate B．an increase in respiration rate C．a reduction in blood pressure

正确答案：B

(29)If whilst flying at 30,000ft, the aircraft suddenly depressurizes, the most common symptom experienced by all persons on board would be

? ? ?

A．Sudden inhalation B．Sudden exhalation C．Abdominal pain

正确答案：B

(30)What action should be taken by a crew member following a sudden decompression at 35,000 feet?

? ? ?

A．Deploy passenger oxygen mask B．Don on an oxygen mask C．Make immediate descent

正确答案：B

(31)Itic barotraumas means that gas is trapped in the

? ? ?

A．Gut B．Sinuses C．Middle ear

正确答案：C