题目内容
词汇与结构The cabin of an aircraft is pressurized by using engine bleed air, which is conditioned and ______into the cabin.
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词汇与结构The amount and pressure of the conditioned air is regulated by a computer and _____ valves.
词汇与结构Passengers with conditions such as a pneumothorax are advised not to fly until fully ______ ; pain may still be experienced in the ears and sinuses by people suffering from a cold or other infection.
词汇与结构That destination may be significantly above sea level and this needs to be taken into _______ .
词汇与结构It is then expanded and cooled to a suitable temperature by passing it _____a heat exchanger and air cycle machine.
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