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必需的目视基准
avia.
required visual reference
(与在进近到跑道上的飞机有关,指跑道的进近区域段或目视设备,能够使飞行员评估飞机相对于名义飞行路线的位置和位置变化率,以决定进近是否能够安全继续到完成着陆)
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