北斗导航粗糙四十纳米精度如何?天热如何戴口罩健身传染真危险 Beidou navigation with 40 NM chips, how to wear a mask when it is hot.

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北斗导航粗糙四十纳米精度如何?天热如何戴口罩健身传染真危险 Beidou navigation with 40 NM chips, how to wear a mask when it is hot. (20200609)
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