If the airplane has a built-in auxiliary power unit, describe it and explain how it fits in with the electrical system.
AA. 如果飞机有一个内置的辅助动力装置，请对其进行描述并说明其如何与电气系统配合使用。
BB. 如果飞机有一个附加的辅助电源组件，描述该装置并解释它是如何对接电气系统的。
CC. 如果飞机有一个内置的辅助动力装置，描述该装置并解释它是如何装配到电气系统的。
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