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单选题
起飞后，起落架收上，襟翼20或更小,并且油门杆从起飞卡位收回，则引气负荷：After takeoff, with the landing gear up, flaps 20 or less and the thrust levers retarded from takeoff detent, bleed air loading:
A
仍保持在APU上直到巡航阶段。remains on APU until cruise
B
仍保持在发动机上直到着陆。remains on engines until after landing
C
从发动机转换到APU上。 transfers from the engines to the APU
D
从APU转换到发动机上。 transfers from the APU to the engines
答案解析
正确答案：D
