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单选题
Airborne Auxiliary Power are those airborne power plants (engines) which are installed on the aircraft for the purpose of generating and supplying a single type or combination of auxiliary electric, hydraulic, pneumatic or other power.
A
“机载辅助动力”是指安装在飞机上的机载动力装置（发动机），其目的是用于产生和提供单一类型的辅助电力、气压、气动或其他动力。
B
“机载辅助动力”是指安装在飞机上的机载动力装置（发动机），用于产生和提供单一类型的辅助电源、液压或气源动力等或者组合型动力。
C
“机载辅助动力”是指安装在飞机上的机载动力装置（发动机），其目的是用于产生和提供组合型的辅助电力、液压、电动或其他动力。
答案解析
正确答案：B
相关知识点：
机载辅助动力部件用途明
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