题目内容 (请给出正确答案)
[单选题]

Each air carrier flight cdck aorwmember on flight deck duty must be provided with an oxygen mask that can be rapidly placed on his face when operating at flight altitudes

A.of FL 260.

B.of FL 250.

C.Above FL 250.

提问人:网友lixin080108 发布时间:2022-01-07
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