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China’s BeiDou Navigation Satellite Syst...

China’s BeiDou Navigation Satellite System, whose positioning      will reach 2.5 meters by 2020, will soon provide services to more countries.

A. accuracy    B. category    C. function    D. reference

 

A 【解析】 考查名词。A. accuracy精确度; B. category种类,分类; C. function功能; D. reference参考。句意:到2020年,中国北斗导航卫星系统的定位精度将达到2.5米,不久将向更多国家提供服务。结合句意可知答案为A。  
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