题目内容
词汇与结构Cabin altitude is not normally______ at ground level (0ft) pressure throughout the flight because doing so stresses the fuselage and uses more fuel.
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词汇与结构_______ is achieved by the design of an airtight fuselage engineered to be pressurized, a source of compressed air and an environmental control system (ECS).
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.
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.
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