
Optics and optical instruments - Ancillary devices for geodetic instruments Part 1: Invar levelling staffs (ISO 12858-1:2014)
出版:German Institute for Standardisation (Deutsches Institut für Normung)

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Optics and optical instruments - Ancillary devices for geodetic instruments Part 1: Invar levelling staffs (ISO 12858-1:2014)
出版:German Institute for Standardisation (Deutsches Institut für Normung)
专家解读视频