900 句单选 -15 字以上 -317[音频][音频]
A. 26 miles
B. 1 minute
C. 20 miles
D. 24 miles
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900 句单选 -15 字以上 -648[音频][音频]
A. Oxygen pressure is dropping
B. Nearly collide with the mountain
C. To fly heading 050
Descend to FL180
900 句单选 -15 字以上 -371[音频][音频]
A. Flow control is exercised
B. Landing delay at the destination airport
C. Maintain FL100
D. Hold at BKM
900 句单选 -15 字以上 -734[音频][音频]
A. Land quickly
B. make a quick heading change
C. climb immediately to avoid ice pellets
D. squawk 7700
900 句单选 -15 字以上 -75[音频][音频]
A. expect further clearance 37
B. outbound time 2 minutes
C. 105
D. 180