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GB/T 6609.25-2023
氧化铝化学分析方法和物理性能测定方法 第25部分:松装和振实密度的测定
Chemical analysis methods and determination of physical performance of alumina—Part 25: Method for the determination of tapped and untapped density
GB/T 6609.35-2023
氧化铝化学分析方法和物理性能测定方法 第35部分:比表面积的测定 氮吸附法
Chemical analysis methods and determination of physical performance of alumina—Part 35: Determination of specific surface area—Nitrogen adsorption method
GB/T 20490-2023
Non-destructive testing (NDT) methods of steel tubes—Automated ultrasonic testing of seamless and welded steel tubes for the detection of laminar imperfections
GB/T 713.3-2023
Steel plate,sheet and strip for pressure equipments—Part 3:Low alloy steel with specified low temperature properties
GB/T 42923-2023
Glass-fibre-reinforced plastic products—Determination of fibre length
GB/T 42922-2023
Plastics—Determination of matter extractable by organic solvents—Chemical methods