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全球定位系统卫星信号
GPS satellite signal
全球导航卫星系统
Global Navigation Satellite System
卫星遥感用于资源管理、环境评价和全球变 化研究:发展中世界的需要和应用国际会议
International Conference on Satellite Remote Sensing for Resource Management, Environmental Assessment and Global Change Studies: Needs and Applications for the Developing World
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