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GB/T 15596-2021
塑料 在玻璃过滤后太阳辐射、自然气候或实验室辐射源暴露后颜色和性能变化的测定
Plastics—Determination of changes in colour and variations in properties after exposure to glass-filtered solar radiation, natural weathering or laboratory radiation sources
GB/T 24488-2021
Test method for electrochemical properties of magnesium alloys sacrificial anode
GB/T 14949.2-2021
Manganese ores—Determination of nickel content—Flame atomic absorption spectrometric method
GB/T 7731.1-2021
Ferrotungsten—Determination of tungsten content—Cinchonine gravimetric method and ammonium nitrate gravimetric method
GB/T 8013.4-2021
Anodic oxide coatings and organic polymer coatings on aluminium and its alloys—Part 4: Texture coatings
GB/T 40338-2021
Corrosion of metals and alloys—Exfoliation corrosion testing of aluminium alloys
GB/T 40329-2021
Electrical equipment and system of industrial machines—PLC programme in numerical control system
GB/T 7728-2021
Chemical analysis of metallurgical products—General rule for flame atomic absorption spectrometric methods
GB/T 5195.11-2021
Fluorspar—Determination of manganese content—Periodate spectrophotometry and flame atomic absorption spectrometry