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above obstruction level
avia.
越障高度
(飞机相对于飞行区域内的地形、建筑及障碍物等的高度。飞机执行低空飞行任务时推荐使用此高度。飞行员可以根据地图或航图上所示的高度,或者使用地形跟踪雷达来计算所需的飞行高度,使飞机始终保持恒定的高度。越障高度>离地高度)
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