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jun 23, 2020 - 2020 中国提前半年完成北斗全球系统星座部署

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#2020.6.23

中国在西昌卫星发射中心成功发射第55颗北斗导航卫星，提前【半年】完成北斗全球系统星座部署。

北斗卫星导航系统：中国自主研发的全球卫星导航系统，可以在全球范国内为人们提供全天候高精度的定位与授时服务

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人教版高中历史|Chinese students' PEP SENIOR HIGH HISTORY TEXTBOOKS

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jun 23, 2020

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