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单选题
478.前货舱的冷空气来自哪里( )Where from the cold air of the forward cargo compartment
A
组件1 PACK1
B
组件2 PACK2
C
混合组件The mix unit
答案解析
正确答案：B
解析：
前货舱的冷空气来自哪里？
答案：B. 组件2 PACK2
解析：前货舱的冷空气是通过组件2的PACK2（气源装置）供应的。PACK（Pressure Air Conditioning Kit）是飞机上用来调节和供应空气的设备之一，组件2对应的是前部区域，因此冷空气来自组件2的PACK2。
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