287.空气进气门何时关闭( ) When is the air intake flap closed ?

　地面时 On the ground.

　.APU空中运转时 When the APU is running in flight

　APU停车时 When the APU is shut-down.

正确答案：C

解析：

空气进气门何时关闭？解析：正确答案是C，即APU停车时。空气进气门是用来控制APU（辅助动力单元）的进气的，当APU停车（关机）时，进气门会关闭，阻止进气。

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A330机型熟悉课程试题

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