题目内容
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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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.
词汇与结构The pilot can _____the cabin pressure at will through the outflow valve.
词汇与结构Operational considerations typically require it to be set at 6,000 to 8,000 ft (1,800 to 2,400 m) – the latter being approximately 11 psi（pound per square inch）, giving a pressure _______ between the cabin and the outside air of around 7.5–8 psi.
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