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单选题
640.当氧气面罩上正常/100%选择器选择在正常位时( )What happen if the NORM/100% selecter in NORM position on crew oxygen mask?
A
无论什么高度都供给氧气和空气的混合气 No matter what altitude is the mask supply mixture of oxygen and air
B
座舱低高度时,供给氧气和空气的混合气,当座舱高度达到一定高度时供给纯氧 Cockpit low altitude, the mixture of oxygen and air supply, when supply pure oxygen cabin altitude reaches a certain height
C
无论什么高度都供给纯氧 No matter what altitude is the mask supply pure oxygen
答案解析
正确答案：B
解析：
当氧气面罩上正常/100%选择器选择在正常位时( )What happen if the NORM/100% selecter in NORM position on crew oxygen mask?
答案:B
解析: 当氧气面罩上的正常/100%选择器选择在正常位时，意味着面罩会在座舱低高度时供给氧气和空气的混合气，但当座舱高度达到一定高度时，它会切换为供给纯氧。这是为了确保在高海拔高度时，机组人员能够获得足够的氧气来呼吸，以应对缺氧的情况。
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