【单选题】
A 在接近改平高度层时，减小上升或下降率至500-1000英尺/分钟 Use climb and descent rate of 500-1000ft/min when the distance to designed altitude is 1000ft
B 通过TCAS显示观察相关飞机，自行建立2000英尺的垂直间隔，直到无影响后，再在指定高度层改平 Observe the relevant aircraft through TCAS display,establish 2000ft vertical seperation by oneself,then return to the assigned altitude after no effect
C 脱开自动驾驶，人工柔和改平 Disconnect AP,manually and softly level off the aircraft
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