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单选题
476.再循环活门的功能是( )What is the function of the recirculation valve?
A
当两台组件都不工作时,切断供向电子设备的混合空气 When the two Packs are not at work, cut off the mixed air supplied to the avionics equipment
B
当两台组件都不工作时,使电子设备有足够的通风 When the two packs are not working, make the electronic device has sufficient ventilation
C
当两台组件都不工作时,切断供向电子设备的再循环空气 When the two packs are not working, make the avionics equipment has sufficient ventilation
答案解析
正确答案：B
解析：
题目解析
答案：B
解析：再循环活门的主要功能是在飞机上的两个Pack（空气调节装置）都不工作时，确保电子设备获得足够的通风。B选项描述了这个功能，即当两个Pack都不工作时，再循环活门会确保电子设备获得足够的通风，以防止过热或缺氧的情况。
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