题目内容
词汇与结构The most common source of compressed air for pressurization is bleed air ______ from the compressor stage of a gas turbine or turboprop propulsion engine, usually the second or third last compressor ring.
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词汇与结构Typically, compressed air is bled from at least two propulsion engines each system being fully ________.
词汇与结构Compressed air is also _____from the Auxiliary Power Unit, if fitted, in the event of an emergency and for cabin air supply on the ground before the main engines are started.
词汇与结构All exhaust air is _____to atmosphere via a valve, usually at the rear of the fuselage.
词汇与结构This valve controls the cabin pressure and also ______as a safety relief.
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