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See Chinese contents: GB/T 38216.2-2019 GB/T 38216.2-2019: Steel slag -- Determination of fluoride content and chloride content -- Ion chromatography
This document specifies the technical information and file format of spectacle frames and sunglasses for trade use, and optimizes the transaction and processing of customized lenses (matching specified spectacle frames). This document applies to spectacle frames and sunglasses, as well as sunglasses clips and sets of lenses.
