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| precision approach path indicator (在飞机进近人跑道时，能够提供目视下降导引信息的一组灯光系统。这个系统与目视进近下滑道指示器 (VASI )相似。然而灯光系统是以每排2个或4个灯光安置在跑道的左侧。这些系统的有效距离，在白天是5m,而在晚上可达20m 以上) | |||
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