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GB/T 6379.1-2004 Accuracy(trueness and precision)of measurement methods and results—Part 1:General principles and definitions GB/T 6379.2-2004 Accuracy(trueness and precision)of measurement methods and results—Part 2:Basic method for the determination of repeatability and reproducibility of a standard measurement method GB/T 6682-1992 Water for analytical laboratory use—Specification and test methods GB/T 6682-2008 Water for analytical laboratory use—Specification and test methods GB/T 12806-1991 Laboratory glassware—One-mark volumetric flasks GB/T 12806-2011 Laboratory glassware—One-mark volumetric flasks GB/T 12808-1991 Laboratory glassware—One-mark pipettes GB/T 12808-2015 Laboratory glassware—One mark pipettes GB/T 12809-1991 Laboratory glassware—Principles of design and construction of volumetric glassware GB/T 12809-2015 Laboratory glassware—Principles of designand construction of volumetric glassware GB/T 12810-1991 Laboratory glassware—Volumetric glassware—Methods for use and testing of capacity GB/T 12810-2021 Laboratory glassware—Capacity methods testing and use of volumetric instruments GB/T 20066-2006 Steel and iron—Sampling and preparation of samples for the determination of chemical composition