题目内容
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.
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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.
词汇与结构Recirculation fans ______the packs to maintain a constant ventilation rate through the cabin.
词汇与结构Hot trim air from the bleed air system is added to the pack conditioned air to _____the temperature in each zone.
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