题目内容
词汇与结构An aircraft planning to cruise at 40,000 ft (12,000 m) is programmed to rise gradually from take-off to around 8,000 ft (2,400 m) in cabin pressure altitude, and to then reduce gently to ______ the ambient air pressure of the destination.
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词汇与结构Pressurization of aircraft cabins above 3,000 meters (9,800 ft) generally avoids significant hypoxia, altitude sickness, _________ and barotrauma.
词汇与结构An oxygen system is ________ but only for emergency use and only intended to allow time to descend to a safe altitude.
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.
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).
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