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The Radio Altimeter (RA) system determines the height of the aircraft above the terrain during initial climb, approach and landing phase.

AA. 无线电高度表在初始爬升时确定飞机距离地面的高度,确定飞机是否进入进近和着陆阶段。

BB. 无线电高度表在初始爬升

CC. 无线电高度表在初始爬升

正确答案:A (备注:此答案有误)

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