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GB/T 12898-2009 English PDF (GBT12898-2009)

GB/T 12898-2009 English PDF (GBT12898-2009)

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GB/T 12898-2009: Specification for the third and fourth order leveling
This standard specifies the principles for the establishment of the third and fourth order leveling network, leveling methods, precision indicators and technical requirements. This standard applies to the deployment of the third and fourth order leveling network.

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