China National Standards

China Determinatio GB Standards English PDF List


GB standards are the China national standards; Prefix code GB are Mandatory standards, GB/T are Recommended standards; All products or service must be compliance with GB standards; If you want to export products or services to huge Chinese market, need ensure they are meet the requirements of GB china national standards;  We provide Chinese GB standards and English version GB standards  Lookup, Translate, Download, Imported Commodity GB standards Testing and Compliance review services.
  •  China "Determinatio" GB Standards English PDF List:
  • Standard  Code Standard Title Standard Class Order
    GB/T 40394-2021 Determination of trace trimethylamine in methanol for industrial use—Gas chromatography-mass spectrometry
    工业用甲醇中痕量三甲胺含量的测定 气相色谱质谱联用法
    China National Standards
    Determinatio

    English PDF
    GB/T 40369-2021 General rules for Determination of immunochromatographic test strip
    免疫层析试纸条检测通则
    China National Standards
    Determinatio

    English PDF
    GB/T 40368-2021 Determination of kunitz trypsin inhibitor of plant metabolites—Enzyme-linked immunosorbent assay
    植物代谢产物胰蛋白酶抑制因子测定 酶联免疫吸附法
    China National Standards
    Determinatio

    English PDF
    GB/T 40367-2021 Plastics—Determination of the aerobic biodegradation of non-floating materials exposed to marine sediment—Method by analysis of evolved carbon dioxide
    塑料 暴露于海洋沉积物中非漂浮材料最终需氧生物分解能力的测定 通过分析释放的二氧化碳的方法
    China National Standards
    Determinatio

    English PDF
    GB/T 40348-2021 Determination of capsaicinoid in plant derived products—Liquid chromatography-tandem mass spectrometry
    植物源产品中辣椒素类物质的测定 液相色谱-质谱/质谱法
    China National Standards
    Determinatio

    English PDF
    GB/T 40345-2021 Crop protection equipment—Test method for the Determination of drainable volume and its concentration
    植物保护机械 确定可排放液体体积及浓度的试验方法
    China National Standards
    Determinatio

    English PDF
    GB/T 40342-2021 Method for Determination of aluminum content in hot dipped zinc-aluminum alloy coating on steel wire
    钢丝热镀锌铝合金镀层中铝含量的测定
    China National Standards
    Determinatio

    English PDF
    GB/T 40323-2021 Determination of octamethylcyclotetrasiloxane(D4), decamethylcyclopentasiloxane(D5) and dodecamethylcyclohexasiloxane(D6) in textile dyeing and finishing auxiliaries
    纺织染整助剂产品中八甲基环四硅氧烷(D4)、十甲基环五硅氧烷(D5)和十二甲基环六硅氧烷(D6)的测定
    China National Standards
    Determinatio

    English PDF
    GB/T 40312-2021 Ferrophosphorus—Determination of phosphorus, silicon, manganese and titanium content—Wavelength dispersive X-ray fluorescence spectrometry method (fused cast bead method)
    磷铁 磷、硅、锰和钛含量的测定 波长色散X射线荧光光谱法(熔铸玻璃片法)
    China National Standards
    Determinatio

    English PDF
    GB/T 40311-2021 Vanadium slag—Determination of multi-element contents—Wavelength dispersive X-ray fluorescence spectrometry(fused cast bead method)
    钒渣 多元素的测定 波长色散X射线荧光光谱法(熔铸玻璃片法)
    China National Standards
    Determinatio

    English PDF
    GB/T 40304-2021 Determination of content of nonmetallic inclusions in steel—Billet full section method
    钢中非金属夹杂物含量的测定 钢坯全截面法
    China National Standards
    Determinatio

    English PDF
    GB/T 40302-2021 Plastics—Determination of burning behaviour of thin flexible vertical specimens in contact with a small-flame ignition source
    塑料 立式软薄试样与小火焰源接触的燃烧性能测定
    China National Standards
    Determinatio

    English PDF
    GB/T 40281-2021 Determination of content of nonmetallic inclusions in steel—Extremum analytical method
    钢中非金属夹杂物含量的测定 极值分析法
    China National Standards
    Determinatio

    English PDF
    GB/T 40280-2021 Plastics—Resins in the liquid state or as emulsions or dispersions—Determination of apparent viscosity using a single cylinder type rotational viscometer method
    塑料 液态或乳液态或分散体系的树脂 用单筒旋转黏度计测定表观黏度
    China National Standards
    Determinatio

    English PDF
    GB/T 39715.4-2021 Plastics—Biobased content—Part 4: Determination of biobased mass content
    塑料 生物基含量 第4部分:生物基物质含量的测定
    China National Standards
    Determinatio

    English PDF
    GB/T 39715.3-2021 Plastics—Biobased content—Part 3:Determination of biobased synthetic polymer content
    塑料 生物基含量 第3部分:生物基合成聚合物含量的测定
    China National Standards
    Determinatio

    English PDF
    GB/T 39715.2-2021 Plastics—Biobased content—Part 2: Determination of biobased carbon content
    塑料 生物基含量 第2部分:生物基碳含量的测定
    China National Standards
    Determinatio

    English PDF
    GB/T 33047.3-2021 Plastics—Thermogravimetry (TG) of polymers—Part 3: Determination of the activation energy using the Ozawa-Friedman plot and analysis of the reaction kinetics
    塑料 聚合物热重法(TG) 第3部分:使用 Ozawa-Friedman 绘图测定活化能和分析反应动力学
    China National Standards
    Determinatio

    English PDF
    GB/T 33047.2-2021 Plastics—Thermogravimetry (TG) of polymers—Part 2: Determination of activation energy
    塑料 聚合物热重法(TG) 第2部分:活化能的测定
    China National Standards
    Determinatio

    English PDF
    GB/T 20899.6-2021 Methods for chemical analysis of gold ores—Part 6: Determination of zinc content
    金矿石化学分析方法 第6部分:锌量的测定
    China National Standards
    Determinatio

    English PDF
    GB/T 20899.5-2021 Methods for chemical analysis of gold ores—Part 5: Determination of lead content
    金矿石化学分析方法 第5部分:铅量的测定
    China National Standards
    Determinatio

    English PDF
    GB/T 20899.4-2021 Methods for chemical analysis of gold ores—Part 4: Determination of copper content
    金矿石化学分析方法 第4部分:铜量的测定
    China National Standards
    Determinatio

    English PDF
    GB/T 15596-2021 Plastics—Determination of changes in colour and variations in properties after exposure to glass-filtered solar radiation, natural weathering or laboratory radiation sources
    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
    China National Standards
    Determinatio

    English PDF
    GB/T 14949.2-2021 Manganese ores—Determination of nickel content—Flame atomic absorption spectrometric method
    锰矿石 镍含量的测定 火焰原子吸收光谱法
    China National Standards
    Determinatio

    English PDF
    GB/T 14949.11-2021 Manganese ores—Determination of carbon content—Gravimetric method and infrared absorption method
    锰矿石 碳含量的测定 重量法和红外线吸收法
    China National Standards
    Determinatio

    English PDF
    GB/T 14637-2021 Determination of copper,iron and zinc in industrial circulating cooling water and scale—Atomic absorption spectrometric method
    工业循环冷却水及水垢中铜、铁、锌的测定 原子吸收光谱法
    China National Standards
    Determinatio

    English PDF
    GB/T 14636-2021 Determination of calcium and magnesium in industrial circulating cooling water and scale—Atomic absorption spectrometric method
    工业循环冷却水及水垢中钙、镁的测定 原子吸收光谱法
    China National Standards
    Determinatio

    English PDF
    GB/T 7739.6-2021 Methods for chemical analysis of gold concentrates—Part 6: Determination of zinc content
    金精矿化学分析方法 第6部分:锌量的测定
    China National Standards
    Determinatio

    English PDF
    GB/T 7739.5-2021 Methods for chemical analysis of gold concentrates—Part 5: Determination of lead content
    金精矿化学分析方法 第5部分:铅量的测定
    China National Standards
    Determinatio

    English PDF
    GB/T 7731.5-2021 Ferrotungsten—Determination of silicon content—Silicomolybdenum blue spectrophotometric method
    钨铁 硅含量的测定 硅钼蓝分光光度法
    China National Standards
    Determinatio

    English PDF
    GB/T 7731.4-2021 Ferrotungsten—Determination of phosphorus content—Phosphorus molybdenum blue spectrophotometric method
    钨铁 磷含量的测定 磷钼蓝分光光度法
    China National Standards
    Determinatio

    English PDF
    GB/T 7731.1-2021 Ferrotungsten—Determination of tungsten content—Cinchonine gravimetric method and ammonium nitrate gravimetric method
    钨铁 钨含量的测定 辛可宁重量法和硝酸铵重量法
    China National Standards
    Determinatio

    English PDF
    GB/T 7731.10-2021 Ferrotungsten—Determination of carbon content—Infrared absorption method
    钨铁 碳含量的测定 红外线吸收法
    China National Standards
    Determinatio

    English PDF
    GB/T 6324.11-2021 Test method of organic chemical products—Part 11:Determination of trace arsenic in liquid products—Atomic fluorescence spectrometric method
    有机化工产品试验方法 第11部分:液体化工产品中微量砷的测定 原子荧光法
    China National Standards
    Determinatio

    English PDF
    GB/T 6288-2021 Determination of particle size for granular molecular sieve
    粒状分子筛粒度测定方法
    China National Standards
    Determinatio

    English PDF
    GB/T 6287-2021 Determination of static adsorbed water for molecular sieve
    分子筛静态水吸附测定方法
    China National Standards
    Determinatio

    English PDF
    GB/T 6286-2021 Determination of bulk density for molecular sieve
    分子筛堆积密度测定方法
    China National Standards
    Determinatio

    English PDF
    GB/T 6017-2021 Determination of purity and hydrocarbon impurities of butadiene for industrial use—Gas chromatographic method
    工业用丁二烯纯度及烃类杂质的测定 气相色谱法
    China National Standards
    Determinatio

    English PDF
    GB/T 6015-2021 Determination of trace dimer and residual extraction agent of butadiene for industrial use—Gas chromatographic method
    工业用丁二烯中微量二聚物和残留抽提剂的测定 气相色谱法
    China National Standards
    Determinatio

    English PDF
    GB/T 5687.13-2021 Ferrochromium—Determination of chromium, silicon, manganese, titanium, vanadium, iron contents—Wavelength dispersive X-ray fluorescence spectrometry (fused cast bead method)
    铬铁 铬、硅、锰、钛、钒和铁含量的测定 波长色散X射线荧光光谱法(熔铸玻璃片法)
    China National Standards
    Determinatio

    English PDF
    GB/T 5211.14-2021 General methods of test for pigments and extenders—Part 14: Determination of residue on sieve—Mechanical flushing procedure
    颜料和体质颜料通用试验方法 第14部分:筛余物的测定 机械冲洗法
    China National Standards
    Determinatio

    English PDF
    GB/T 5195.11-2021 Fluorspar—Determination of manganese content—Periodate spectrophotometry and flame atomic absorption spectrometry
    萤石 锰含量的测定 高碘酸盐分光光度法和火焰原子吸收光谱法
    China National Standards
    Determinatio

    English PDF
    GB/T 2408-2021 Plastics—Determination of burning characteristics—Horizontal and vertical test
    塑料 燃烧性能的测定 水平法和垂直法
    China National Standards
    Determinatio

    English PDF
    GB/T 1845.2-2021 Plastics—Polyethylene (PE) moulding and extrusion materials—Part 2:Preparation of test specimens and Determination of properties
    塑料 聚乙烯(PE)模塑和挤出材料 第2部分:试样制备和性能测定
    China National Standards
    Determinatio

    English PDF
    GB/T 1425-2021 Determination of melting temperature range for precious metals and their alloys—Testing method of thermal analysis
    贵金属及其合金熔化温度范围的测定 热分析试验方法
    China National Standards
    Determinatio

    English PDF
    GB/T 614-2021 Chemical reagent—General method for the Determination of refractive index
    化学试剂 折光率测定通用方法
    China National Standards
    Determinatio

    English PDF
    GB/T 611-2021 Chemical reagent—General method for the Determination of refractive index
    化学试剂 密度测定通用方法
    China National Standards
    Determinatio

    English PDF
    GB/T 223.91-2021 Iron, steel and alloy—Determination of copper—2,2’-Biquinoline spectrophotometric method
    钢铁及合金 铜含量的测定 2,2'-联喹啉分光光度法
    China National Standards
    Determinatio

    English PDF
    GB/T 223.90-2021 Iron, steel and alloy—Determination of silicon content—Inductively coupled plasma atomic emission spectrometric method
    钢铁及合金 硅含量的测定 电感耦合等离子体原子发射光谱法
    China National Standards
    Determinatio

    English PDF
    GB/T 40380.1-2021 Metallic powders—Determination of apparent density and flow rate at elevated temperatures—Part 1: Determination of apparent density at elevated temperatures
    金属粉末 高温时松装密度和流速的测定 第1部分:高温时松装密度的测定
    China National Standards
    Determinatio

    English PDF
    GB/T 40377-2021 Corrosion of metals and alloys—Determination of AC corrosion—Protection criteria
    金属和合金的腐蚀 交流腐蚀的测定 防护准则
    China National Standards
    Determinatio

    English PDF
    GB/T 40374-2021 Hardmetals—Determination of lead and cadmium content—Flame atomic absorption spectrometric method and inductively coupled plasma atomic emission spectrometry
    硬质合金化学分析方法 铅量和镉量的测定 火焰原子吸收光谱法和电感耦合等离子体原子发射光谱法
    China National Standards
    Determinatio

    English PDF
    GB/T 40500-2021 Determination of total aromatics composition in aviation fuels—Gas chromatography
    喷气燃料中芳烃总量的测定 气相色谱法
    China National Standards
    Determinatio

    English PDF
    GB/T 40496-2021 Determination of antioxidant content in jet fuel—High performance liquid chromatography
    喷气燃料中抗氧剂含量的测定 高效液相色谱法
    China National Standards
    Determinatio

    English PDF
    GB/T 40493-2021 Determination of lead, cadmium, chromium and mercury content in the finishing material of wood-based panel
    人造板饰面材料中铅、镉、铬、汞重金属元素含量测定
    China National Standards
    Determinatio

    English PDF
    GB/T 40486-2021 Determination of melittin content in bee venom powder—High performance liquid chromatography
    蜂毒干粉中蜂毒溶血肽含量的测定 高效液相色谱法
    China National Standards
    Determinatio

    English PDF
    GB/T 16840.8-2021 Technical Determination methods for electrical fire evidence—Part 8: Method of thermal analysis
    电气火灾痕迹物证技术鉴定方法 第8部分: 热分析法
    China National Standards
    Determinatio

    English PDF
    GB/T 16840.7-2021 Technical Determination methods for electrical fire evidence—Part 7:Component analytic method of energy dispersive spectrometry
    电气火灾痕迹物证技术鉴定方法 第7部分:EDS成分分析法
    China National Standards
    Determinatio

    English PDF
    GB/T 16840.4-2021 Technical Determination methods for electrical fire evidence—Part 4: Metallographic analysis method
    电气火灾痕迹物证技术鉴定方法 第4部分:金相分析法
    China National Standards
    Determinatio

    English PDF
    GB/T 16840.3-2021 Technical Determination methods for electrical fire evidence—Part 3: Auger electron spectroscopy component analytic method
    电气火灾痕迹物证技术鉴定方法 第3部分:俄歇分析法
    China National Standards
    Determinatio

    English PDF
    GB/T 16840.2-2021 Technical Determination methods for electrical fire evidence—Part 2: Residual magnetism method
    电气火灾痕迹物证技术鉴定方法 第2部分:剩磁检测法
    China National Standards
    Determinatio

    English PDF
    GB/T 40357-2021 Hair products—Determination of the permeability of hairpiece to air
    发制品 假发透气性的测定
    China National Standards
    Determinatio

    English PDF
    GB/T 40612-2021 Plastics—Determination of aerobic biodegradation of non-floating plastic materials in a seawater/sediment interface—Method by analysis of evolved carbon dioxide
    塑料 海水沙质沉积物界面非漂浮塑料材料最终需氧生物分解能力的测定 通过测定释放二氧化碳的方法
    China National Standards
    Determinatio

    English PDF
    GB/T 40146-2021 Determination of plastic microbead in cosmetics
    化妆品中塑料微珠的测定
    China National Standards
    Determinatio

    English PDF
    GB/T 40272-2021 Paper,board,pulps and cellulose nanomaterials—Determination of acid-soluble magnesium,calcium,manganese,iron,copper,sodium and potassium
    纸、纸板、纸浆和纤维素纳米材料 酸溶镁、钙、锰、铁、铜、钠、钾的测定
    China National Standards
    Determinatio

    English PDF
    GB/T 40268-2021 Determination of performance on immunomagnetic material
    免疫磁性材料性能检测方法
    China National Standards
    Determinatio

    English PDF
    GB/T 40267-2021 Determination of Levodopa in plant derived products—High performance liquid chromatography
    植物源产品中左旋多巴的测定 高效液相色谱法
    China National Standards
    Determinatio

    English PDF
    GB/T 40265-2021 General rules for Determination of enzyme immunoassay antibodies
    酶免疫检测抗体检测通则
    China National Standards
    Determinatio

    English PDF
    GB/T 40220-2021 Determination of soybean agglutinin of plant metabolites—Enzyme-linked immunosorbent assay
    植物代谢产物大豆凝集素测定 酶联免疫吸附法
    China National Standards
    Determinatio

    English PDF
    GB/T 40191-2021 Determination of restricted preservatives in toothpaste—High performance liquid chromatography method
    牙膏中限用防腐剂的测定 高效液相色谱法
    China National Standards
    Determinatio

    English PDF
    GB/T 40190-2021 Determination of forbidden bleach in toothpaste—High performance liquid chromatography method
    牙膏中禁用漂白剂的测定 高效液相色谱法
    China National Standards
    Determinatio

    English PDF
    GB/T 40189-2021 Determination of metronidazole and norfloxacin in toothpaste—High performance liquid chromatography method
    牙膏中甲硝唑和诺氟沙星的测定 高效液相色谱法
    China National Standards
    Determinatio

    English PDF
    GB/T 40186-2021 Determination of genetic material damage strength for microbial mutation breeding—Umu method
    微生物诱变育种致遗传物质损伤强度测定 Umu法
    China National Standards
    Determinatio

    English PDF
    GB/T 40185-2021 Determination of 5 kinds of ammonium chloride antibacterial agents in toothpaste—High performance liquid chromatography method
    牙膏中5种氯铵类抗菌剂的检测方法 高效液相色谱法
    China National Standards
    Determinatio

    English PDF
    GB/T 40183-2021 Determination of DNA methylation—Pyrosequencing
    DNA甲基化的测定 焦磷酸测序法
    China National Standards
    Determinatio

    English PDF
    GB/T 40263-2021 Textiles—Determination of short chain chlorinated paraffins
    纺织品 短链氯化石蜡的测定
    China National Standards
    Determinatio

    English PDF
    GB/T 40262-2021 Metal coating fabric—Determination of metal layer adhesive force—Tape method
    金属镀膜织物 金属层结合力的测定 胶带法
    China National Standards
    Determinatio

    English PDF
    GB/T 40231-2021 Restricted substance in electrical and electronic products—Determination of hexavalent chromium—Ion chromatography method
    电子电气产品中的限用物质 六价铬的测定方法 离子色谱法
    China National Standards
    Determinatio

    English PDF
    GB/T 40225-2021 Determination of actin antibody—Western blotting method
    肌动蛋白抗体的检测 免疫印迹法
    China National Standards
    Determinatio

    English PDF
    GB/T 40223-2021 Determination of free gossypol of plant metabolites—Enzyme-linked immunosorbent assay
    植物代谢产物游离棉酚测定 酶联免疫吸附法
    China National Standards
    Determinatio

    English PDF
    GB/T 40179-2021 Determination of organic acids in plant—Liquid chromatography-tandem mass spectrometry
    植物中有机酸的测定 液相色谱-质谱/质谱法
    China National Standards
    Determinatio

    English PDF
    GB/T 40176-2021 Determination of xylobiose in plant-derived products - Hydrophilic intention chromatography
    植物源性产品中木二糖的测定 亲水保留色谱法
    China National Standards
    Determinatio

    English PDF
    GB/T 40173-2021 Determination of reducing-end sugar in water-soluble chitosan—Spectrophotometric method
    水溶性壳聚糖中还原性端基糖的测定 分光光度法
    China National Standards
    Determinatio

    English PDF
    GB/T 40171-2021 General rules for Determination of magnetic bead DNA extraction and purification kit
    磁珠法DNA提取纯化试剂盒检测通则
    China National Standards
    Determinatio

    English PDF
    GB/T 40168-2021 Corrugating medium—Determination of the edge crush resistance after laboratory fluting
    瓦楞芯纸 实验室起楞后边压强度的测定
    China National Standards
    Determinatio

    English PDF
    GB/T 40152-2021 Determination of saccharase activity in honey—Spectrophotometric method
    蜂蜜中蔗糖转化酶的测定 分光光度法
    China National Standards
    Determinatio

    English PDF
    GB/T 40145-2021 Determination of 11 glucocorticoids including desonide in cosmetics—Liquid chromatography-tandem mass spectrometry
    化妆品中地索奈德等十一种糖皮质激素的测定 液相色谱/串联质谱法
    China National Standards
    Determinatio

    English PDF
    GB/T 40114-2021 Jewellery—Determination of precious metal content—Difference method using inductively coupled plasma optical emission spectroscopy
    首饰 贵金属含量的测定 ICP差减法
    China National Standards
    Determinatio

    English PDF
    GB/T 40110-2021 Surface chemical analysis - Determination of surface elemental contamination on silicon wafers by total-reflection X-ray fluorescence (TXRF) spectroscopy
    表面化学分析 全反射X射线荧光光谱法(TXRF)测定硅片表面元素污染
    China National Standards
    Determinatio

    English PDF
    GB/T 40067-2021 Microstructure and defect Determination of tungsten carbide powder
    碳化钨粉末微观组织及缺陷检测方法
    China National Standards
    Determinatio

    English PDF
    GB/T 27800-2021 Determination of the life for static sealing rubber products
    静密封橡胶制品使用寿命的快速预测方法
    China National Standards
    Determinatio

    English PDF
    GB/T 24279.2-2021 Textiles - Determination of certain flame retardants - Part 2: Phosphorus flame retardants
    纺织品 某些阻燃剂的测定 第2部分:磷系阻燃剂
    China National Standards
    Determinatio

    English PDF
    GB/T 22889-2021 Leather—Physical and mechanical tests—Determination of surface coating thickness
    皮革 物理和机械试验 表面涂层厚度的测定
    China National Standards
    Determinatio

    English PDF
    GB/T 22888-2021 Leather - Physical and mechanical tests - Determination of cold crack temperature of surface coatings
    皮革 物理和机械试验 表面涂层低温脆裂温度的测定
    China National Standards
    Determinatio

    English PDF
    GB/T 22808-2021 Leather and fur-Chemical tests-Determination of chlorinated phenols content
    皮革和毛皮 化学试验 含氯苯酚的测定
    China National Standards
    Determinatio

    English PDF
    GB/T 22459.8-2021 Refractory mortars-Part 8:Determination of bleeding
    耐火泥浆 第8部分:泌水性试验方法
    China National Standards
    Determinatio

    English PDF
    GB/T 14949.5-2021 Manganese ores一Determination of titanium content一Diantipyrylmethane spectrophotometric method
    锰矿石 钛含量的测定 二安替吡啉甲烷分光光度法
    China National Standards
    Determinatio

    English PDF
    GB/T 14949.12-2021 Manganese ores - Determination of combined water content - Gravimetric method
    锰矿石 化合水含量的测定 重量法
    China National Standards
    Determinatio

    English PDF
    GB/T 9966.9-2021 Test methods for natural stone—Part 9: Determination of the dynamic modulus of elasticity by measuring the fundamental resonance frequency
    天然石材试验方法 第9部分:通过测量共振基本频率测定动力弹性模数
    China National Standards
    Determinatio

    English PDF
    GB/T 9966.13-2021 Test methods for natural stone—Part 13:Determination of water absorption coefficient by capillarity
    天然石材试验方法 第13部分:毛细吸水系数的测定
    China National Standards
    Determinatio

    English PDF

    Find out:7624Items   |  To Page of: First -Previous-Next -Last  | [1] [2] [3] [4] [5] [6] [7]

     

    +86-755-25831330        sales@gbstandards.org 
    106# Zhongmao Mansion,No.1 Beizhan Road,Shenzhen,China
    ©  RJS Copyright  2001-2024 All Rights Reserved

    - Since 2001 -
    Focus on China Standards & Compliance Services

    www.rjs.cn

    China Licenses

    www.transcustoms.com

    China HS code & Tariff

    www.gbstandards.org

    China National Standards