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GB/T 31032-2023 Chinese PDF (GB/T31032-2023) GB/T 45049-2024 English versions: GB/T 45112-2024

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English versions: GB/T 45112-2024

English versions: GB/T 33492-2024

20-2025_Chinese: Methods for chemical analysis of tungsten concentrates - Part 20: Determination of mercury content - Solid sampling and direct mercury analysis method (Chinese: 钨精矿化学分析方法 第20部分:汞含量的测定 固体进样直接测定法)

English versions: GB 33955-2024

English versions: GB 14371-2024

GB/T 31032-2023 Chinese PDF (GB/T31032-2023) GB/T 45049-2024 English versions: GB/T 45112-2024GB T 31032 2023_Chinese: Welding and acceptance standard for steel pipings and pipelines (Chinese: ) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 31032 2023

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