【单选题】
2500f/m rate of vertical speed is equal to______.___
A. 10m/s
B. 15m/s
C. 20m/s
D. 25m/s
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答案
A
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陆空通话时，什么时候推荐使用“IMMEDIATELY（立即）”这个词：___
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Aeronautical chart is divided into two categories,______. ___
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【单选题】
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