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GB/T 45471-2025_Chinese: Test method for mode III interlaminar fracture toughness of carbon fiber reinforced composite materials - Edge crack torsion method (Chinese: 碳纤维增强复合材料Ⅲ型层间断裂韧性的测定 边缘裂纹扭转法)
and the use of cast irons (Chinese: 石油天然气工业 油气开采中用于含硫化氢环境的材料 第2部分：抗开裂碳钢、低合金钢和铸铁)
GB/T 20931
9-2023_Chinese: Hand-held non-electric power tools - Safety requirements - Part 9: Die grinders (Chinese: 手持式非电类动力工具 安全要求 第9部分：模具用砂轮机)
GB/T 20907-2024 Chinese PDF (GB/T20907-2024) GB/T 32151.32-2024 GB/T 45471-2025_Chinese: Test method forGB T 20907 2024_Chinese: Technical specification for automatic fare collection system of urban rail transit (Chinese: ) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 20907 2024
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