第一代导航卫星系统是20世纪60年代出现的美国的（ ）系统。

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• Single GLS can serves all runway ends and in one airports.（
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• The GLS System eliminates need for “critical areas ” required fo
• The GLS System eliminates need for “critical areas ” required fo
• Single GLS can serves all （ ）and in some cases multiple airp