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告警服务
当航空器可能遇险或出现紧急情况需要进行搜寻和救援工作时,由空中交通管制单位按照一定的规则和程序,提供通信、导航、雷达设备,开展搜寻、推测航空器位置和协助航空器驾驶员处理险情等的服务。是空中交通服务的重要内容。
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marine dinoflagellate
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marine drilling platform
marine drugs
marine ecological carrying capacity
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marine ecological radar
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marine ecological security
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Marine Economic Geography of China
Marine Economics and Sustainable Development Research Center
marine economy
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marine ecosystem dominant species
marine ecosystem experiment station
marine ecosystem keystone species
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