过渡高度以上可供使用的最低飞行高度层。（）<br>A:The lowest flight level available for use above the transition altitude.<br>B:The lowest flight layer available for use above the transition height.<br>C:The lowest flight level available for use above the transition height.<br>D:The lowest flight layer available for use above the transition altitude.

过渡高度以上可供使用的最低飞行高度层。（）
A:The lowest flight level available for use above the transition altitude.
B:The lowest flight layer available for use above the transition height.
C:The lowest flight level available for use above the transition height.
D:The lowest flight layer available for use above the transition altitude.

出自：航空情报执照

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