China National Standards

China on 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 "on" GB Standards English PDF List:
    • Standard  Code Standard Title Standard Class Order
    GB/T 18714.3-2003 Information technology--Open distributed processing--Reference model--Part 3:Architecture
    信息技术 开放分布式处理 参考模型 第3部分:体系结构    		 China National Standards
    on
    English PDF
    GB/T 18311.5-2003 Fibre optic interconnecting devices and passive components--Basic test and measurement procedures--Part 3-5:Examinations and measurements--Wavelength dependence of attenuation
    纤维光学互连器件和无源器件 基本试验和测量程序 第3-5部分:检查和测量 衰减对波长的依赖性    		 China National Standards
    on
    English PDF
    GB/T 18311.4-2003 Fibre optic interconnecting devices and passive components--Basic test and measurement procedures--Part 3-4:Examinations and measurements--Attenuation
    纤维光学互连器件和无源器件 基本试验和测量程序 第3-4部分:检查和测量 衰减    		 China National Standards
    on
    English PDF
    GB/T 18311.40-2003 Fibre optic interconnecting devices and passivecomponents--Basic test and measurement procedures--Part 3-40:Examinations and measurements--Extinction ratio of a polarization maintaining(pm)fibre pigtailed connector
    纤维光学互连器件和无源器件 基本试验和测量程序 第3-40部分:检查和测量 带保偏光纤尾纤连接器的消光比    		 China National Standards
    on
    English PDF
    GB/T 18311.34-2003 Fibre optic interconnecting devices and passive components--Basic test and measurement procedures--Part 3-34:Examinations and measurements--Attenuation of random mated connectors
    纤维光学互连器件和无源器件 基本试验和测量程序 第3-34部分:检查和测量 随机配接连接器的衰减    		 China National Standards
    on
    English PDF
    GB/T 18311.1-2003 Fibre optic interconnecting devices and passive components--Basic test and measurement procedures--Part 3-1:Examinations and measurements--Visual examination
    纤维光学互连器件和无源器件 基本试验和测量程序 第3-1部分:检查和测量 外观检查    		 China National Standards
    on
    English PDF
    GB/T 18310.9-2003 Fibre optic interconnecting devices and passive components--Basic test and measurement procedures--Part 2-9:Tests--Shock
    纤维光学互连器件和无源器件 基本试验和测量程序 第2-9部分:试验 冲击    		 China National Standards
    on
    English PDF
    GB/T 18310.45-2003 Fibre optic interconnecting devices and passive components--Basic test and measurement procedures--Part 2-45:Tests--Durability test by water immersion
    纤维光学互连器件和无源器件 基本试验和测量程序 第2-45部分:试验 浸水耐久性    		 China National Standards
    on
    English PDF
    GB/T 18310.42-2003 Fibre optic interconnecting devices and passive components--Basic test and measurement procedures--Part 2-42:Tests--Static side load for connectors
    纤维光学互连器件和无源器件 基本试验和测量程序 第2-42部分:试验 连接器的静态端部负荷    		 China National Standards
    on
    English PDF
    GB/T 18310.26-2003 Fibre optic interconnecting devices and passive components--Basic test and measurement procedures--Part 2-26:Tests--Salt mist
    纤维光学互连器件和无源器件 基本试验和测量程序 第2-26部分:试验 盐雾    		 China National Standards
    on
    English PDF
    GB/T 18310.22-2003 Fibre optic interconnecting devices and passive components--Basic test andmeasurement procedures--Part 2-22:Tests--Change of temperature
    纤维光学互连器件和无源器件 基本试验和测量程序 第2-22部分:试验 温度变化    		 China National Standards
    on
    English PDF
    GB/T 18310.17-2003 Fibre optic interconnecting devices and passive components--Basic test and measurement procedures--Part 2-17:Tests--Cold
    纤维光学互连器件和无源器件 基本试验和测量程序 第2-17部分:试验 低温    		 China National Standards
    on
    English PDF
    GB/T 18310.14-2003 Fibre optic interconnecting devices and passive components--Basic test and measurement procedures--Part 2-14:Tests--Maximum input power
    纤维光学互连器件和无源器件 基本试验和测量程序 第2-14部分:试验 最大输入功率    		 China National Standards
    on
    English PDF
    GB/T 17574.10-2003 Semiconductor devices--Integrated circuits--Part 2-10:Digital integrated circuits--Blank detail specification for integrated circuit dynamicread/write memories
    半导体器件 集成电路 第2-10部分:数字集成电路 集成电路动态读/写存储器空白详细规范    		 China National Standards
    on
    English PDF
    GB/T 16681-2003 Information technology--Chinese interface specifications of open system
    信息技术 开放系统中文界面规范    		 China National Standards
    on
    English PDF
    GB/T 16608.1-2003 Electromechanical elementary all-or-nothing relays of assessed quality--Part 1:Generic specification
    有质量评定的有或无基础机电继电器 第1部分:总规范    		 China National Standards
    on
    English PDF
    GB/T 15651.3-2003 Discrete semiconductor devices and integrated circuits--Part 5-3:Optoelectronic devices--Measuring methods
    半导体分立器件和集成电路 第5-3部分:光电子器件 测试方法    		 China National Standards
    on
    English PDF
    GB/T 15651.2-2003 Discrete semiconductor devices and integrated circuits--Part 5-2:Optoelectronic devices--Essential ratings and characteristics
    半导体分立器件和集成电路 第5-2部分:光电子器件 基本额定值和特性    		 China National Standards
    on
    English PDF
    GB/T 14258-2003 Information technology--Automatic identification and data capture techniques--Verification ofprint quality of bar code symbols
    信息技术 自动识别与数据采集技术 条码符号印制质量的检验    		 China National Standards
    on
    English PDF
    GB/T 12113-2003 Methods of measurement of touch current and protective conductor current
    接触电流和保护导体电流的测量方法    		 China National Standards
    on
    English PDF
    GB/T 7920.9-2003 Earth-moving machinery--Graders--Terminology and commercial specifications
    土方机械 平地机 术语和商业规格    		 China National Standards
    on
    English PDF
    GB/T 7920.8-2003 Earth-moving machinery--Scrapers--Terminology and commercial specifications
    土方机械 铲运机 术语和商业规格    		 China National Standards
    on
    English PDF
    GB/T 7920.5-2003 Earth-moving machinery--Rollers and landfill compactors--Terminology and commercial specification
    土方机械 压路机和回填压实机 术语和商业规格    		 China National Standards
    on
    English PDF
    GB/Z 19398-2003 Industrial automation systems and integration--Operating conditions for discrete part manufacturing-equipment in industrial environments
    工业自动化系统与集成 离散部件制造设备在工业环境中的工作条件    		 China National Standards
    on
    English PDF
    GB/Z 19397-2003 Industrial robots--EMC test methods and performance evaluation criteria--Guidelines
    工业机器人 电磁兼容性试验方法和性能评估准则 指南    		 China National Standards
    on
    English PDF
    GB/T 19400-2003 Industrial robots--Object handling grasp-type grippers--Vocabulary and presentation of characteristics
    工业机器人 抓握型夹持器物体搬运 词汇和特性表示    		 China National Standards
    on
    English PDF
    GB/T 19399-2003 Industrial robots--Graphical user interfaces for programming and operation of robots(GUI-R)
    工业机器人 编程和操作图形用户接口    		 China National Standards
    on
    English PDF
    GB 7667-2003 The dose of X-rays leakage from electron microscope
    电子显微镜X射线泄漏剂量    		 China National Standards
    on
    English PDF
    GB/T 3382.2-2003 Technical requirements for group 3 facsimile apparatus used in public telephone network--Part 2:Procedures for document facsimile transmission in the general switched telephone network
    文件传真三类机在电话网中的互通技术条件 第2部分:在公用电话交换网上的文件传真传输规程    		 China National Standards
    on
    English PDF
    GB/T 3382.1-2003 Technical requirements for group 3 facsimile apparatus used in public telephone network--Part 1:Standardization of group 3 facsimile terminals for document transmission
    文件传真三类机在电话网中的互通技术条件 第1部分:用于文件传输的三类传真终端的标准化    		 China National Standards
    on
    English PDF
    GB/T 19391-2003 The terms and definition related to global positioning system(GPS)
    全球定位系统(GPS)术语及定义    		 China National Standards
    on
    English PDF
    GB/T 19333.5-2003 Geographic information--Conformance and testing
    地理信息 一致性与测试    		 China National Standards
    on
    English PDF
    GB/T 12690.9-2003 Chemical analysis methods for non-rare earth impurities of rare earth metals andtheir oxides--Determination of chlorine content--Silver nitrate turbidimetric method
    稀土金属及其氧化物中非稀土杂质化学分析方法 氯量的测定 硝酸银比浊法    		 China National Standards
    on
    English PDF
    GB/T 12690.8-2003 Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides--Determination of sodium content--Flame atomic absorption spectrometric method
    稀土金属及其氧化物中非稀土杂质化学分析方法 钠量的测定 火焰原子吸收光谱法    		 China National Standards
    on
    English PDF
    GB/T 12690.7-2003 Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides--Determination of silicon content--Molybdenum blue spectrophotometric method
    稀土金属及其氧化物中非稀土杂质化学分析方法 硅量的测定 钼蓝分光光度法    		 China National Standards
    on
    English PDF
    GB/T 12690.6-2003 Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides--Determination of iron content--Kalium thiocyanate，1，10-phenanthroline spectrophotometric method
    稀土金属及其氧化物中非稀土杂质化学分析方法 铁量的测定 硫氰酸钾、1，10-二氮杂菲分光光度法    		 China National Standards
    on
    English PDF
    GB/T 12690.5-2003 Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides--Determination of Al、Cr、Mn、Fe、Co、Ni、Cu、Zn、Pb content by inductively coupled plasma atomic emission spectrographic method--Determination of Co、M
    稀土金属及其氧化物中非稀土杂质化学分析方法 铝、铬、锰、铁、钴、镍、铜、锌、铅的测定 电感耦合等离子体发射光谱法(方法1) 钴、锰、铅、镍、铜、锌、铝、铬的测定 电感耦合等离子    		 China National Standards
    on
    English PDF
    GB/T 12690.4-2003 Chemical analysis methods for non-rare earth impurities ofrare earth metals and their oxides--Determination of oxygen and nitrogen content--Impulse-infrared and impulse-thermal conductance absorption method
    稀土金属及其氧化物中非稀土杂质化学分析方法 氧、氮量的测定 脉冲-红外吸收法和脉冲-热导法    		 China National Standards
    on
    English PDF
    GB/T 12690.13-2003 Chemical analysis methods for non-rareearth impurities of rare earth metals and their oxides--Determination of molybdenum and tungsten content--Induct-ively coupled plasma atomic emission spectrographic method and inductively coupled plasma mass spectrum
    稀土金属及其氧化物中非稀土杂质化学分析方法 钼、钨量的测定 电感耦合等离子体发射光谱法和电感耦合等离子体质谱法    		 China National Standards
    on
    English PDF
    GB/T 12690.12-2003 Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides--Determination of thorium content--Arsenazo III spectrophotometric method and inductively coupled plasma mass spectrum method
    稀土金属及其氧化物中非稀土杂质化学分析方法 钍量的测定 偶氮胂III分光光度法和电感耦合等离子体质谱法    		 China National Standards
    on
    English PDF
    GB/T 12690.11-2003 Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides--Determination of magnesium content--Flame atomic absorptionspectrometric method
    稀土金属及其氧化物中非稀土杂质化学分析方法 镁量的测定 火焰原子吸收光谱法    		 China National Standards
    on
    English PDF
    GB/T 12690.10-2003 Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides--Determination of phosphorus content by molybdenum blue spectrophotometric method
    稀土金属及其氧化物中非稀土杂质化学分析方法 磷量的测定 钼蓝分光光度法    		 China National Standards
    on
    English PDF
    GB/T 9128-2003 Dimensions of metallic ring-joint gaskets for use with steel pipe flanges
    钢制管法兰用金属环垫 尺寸    		 China National Standards
    on
    English PDF
    GB/T 8606-2003 Thread connectiong dimensions andspecifications of hydraulic fluid power--Quick action couplings
    液压快换接头 螺纹连接尺寸及技术要求    		 China National Standards
    on
    English PDF
    GB/T 5861-2003 Hydraulic fluid power--Quick action couplings--Test methods
    液压快换接头 试验方法    		 China National Standards
    on
    English PDF
    GB/T 5860-2003 Hydraulic fluid power--Quick action couplings--Dimensions and requirements
    液压快换接头 尺寸和要求    		 China National Standards
    on
    English PDF
    GB/T 3934-2003 Specification of gauges for general purpose screw threads
    普通螺纹量规 技术条件    		 China National Standards
    on
    English PDF
    GB/T 3464.2-2003 Long reduced shank taps
    细长柄机用丝锥    		 China National Standards
    on
    English PDF
    GB/T 19362.1-2003 Machine tools--Test conditions for bridge-type milling machines--Testing of the accuracy--Part 1:Fixed bridge (portal-type)machines
    龙门铣床检验条件 精度检验 第1部分:固定式龙门铣床    		 China National Standards
    on
    English PDF
    GB/T 19361-2003 Wire electrical-discharge machines(Unidirectional traveling type)--Testing of the accuracy
    电火花线切割机(单向走丝型) 精度检验    		 China National Standards
    on
    English PDF
    GB/T 19360-2003 Industrial plate screens--Specifications and test methods
    工业用金属穿孔板 技术要求和检验方法    		 China National Standards
    on
    English PDF
    GB/T 17421.4-2003 Test code for machine tools--Part 4: Circular tests for numerically controlled machine tools
    机床检验通则 第4部分:数控机床的圆检验    		 China National Standards
    on
    English PDF
    GB/T 14828-2003 Test method for measuring traction performance of agricultural tyres
    农业轮胎牵引性能试验方法    		 China National Standards
    on
    English PDF
    GB/T 11852-2003 Tolerances and specification of taper gauges
    圆锥量规公差与技术条件    		 China National Standards
    on
    English PDF
    GB/T 10611-2003 Industrial screens--Designation and nominal sizes of apertures
    工业用网 标记方法与网孔尺寸系列    		 China National Standards
    on
    English PDF
    GB/T 9185-2003 Photography--135-size film and magazine--Specifications
    摄影师 135规格胶片和暗盒 规范    		 China National Standards
    on
    English PDF
    GB/T 9102-2003 Nylon 6 dipped tyre cord fabric
    锦纶6轮胎浸胶帘子布    		 China National Standards
    on
    English PDF
    GB/T 656-2003 Chemical reagent--Ammonium dichromate
    化学试剂 重铬酸铵    		 China National Standards
    on
    English PDF
    GB/T 606-2003 Chemical reagent--General method for the determination of water--Karl Fischer method
    化学试剂 水分测定通用方法 卡尔·费休法    		 China National Standards
    on
    English PDF
    GB/T 6850-2003 Cinematography--Labelling of containers for raw-stock motion-picture films and magnetic films--Minimum information specifications
    电影 电影生胶片和涂磁胶片片盒标签 最低限度内容规定    		 China National Standards
    on
    English PDF
    GB/T 19385.2-2003 Textile machinery and accessories--Heald frames--Part 2:Heald-carrying rod fixed directly on the frame stave--Coordinated dimensions
    纺织机械与附件 综框 第2部分:穿综杆直接固定于综框横梁 相关尺寸    		 China National Standards
    on
    English PDF
    GB/T 19385.1-2003 Textile machinery and accessories--Heald frames--Part 1:Heald-carrying rod fixed to the frame stave by rod support--Coordinated dimensions
    纺织机械与附件 综框 第1部分:穿综杆用托座固定于综框横梁 相关尺寸    		 China National Standards
    on
    English PDF
    GB/T 19383-2003 Spinning machinery--Main dimensions and designation of condenser rubbers for cards
    纺纱机械 梳毛机用搓条胶板主要尺寸和标记    		 China National Standards
    on
    English PDF
    GB/T 19373-2003 Determination of carbamate pesticide residues in feeds--Gas chromatography
    饲料中氨基甲酸酯类农药残留量测定 气相色谱法    		 China National Standards
    on
    English PDF
    GB/T 19372-2003 Determination of pyrethroids residues in feeds--Gas chromatography
    饲料中除虫菊酯类农药残留量测定 气相色谱法    		 China National Standards
    on
    English PDF
    GB/T 19371.1-2003 Feed additive--Liquid methionine hydroxy analogue
    饲料添加剂 液态蛋氨酸羟基类似物    		 China National Standards
    on
    English PDF
    GB/T 19369-2003 Turfgrass sod production standard
    草皮生产技术规程    		 China National Standards
    on
    English PDF
    GB/T 19368-2003 Turfgrass seed production standard
    草坪草种子生产技术规程    		 China National Standards
    on
    English PDF
    GB/T 18737.4-2003 Textile machinery and accessories--Beams for winding--Part 4:Quality classification of flanges for Weaver’s beams，warper’s beams and sectional beams
    纺织机械与附件 经轴 第4部分:织轴、整经轴和分段整经轴边盘的质量等级    		 China National Standards
    on
    English PDF
    GB/T 13885-2003 Animal feeding stuffs--Determination of thecontents of calcium，copper，iron，magnesium，manganese，potassium，sodium and zinc--Method using atomic absorption spectrometry
    动物饲料中钙、铜、铁、镁、锰、钾、钠和锌含量的测定 原子吸收光谱法    		 China National Standards
    on
    English PDF
    GB/T 10097-2003 Textile machineryand accessories--Worsted and woollen cards-- Width of cylinder and width on thewire
    纺织机械与附件 精纺、粗纺梳毛机 锡林宽度和针布宽度    		 China National Standards
    on
    English PDF
    GB/T 19380-2003 Determination and classification of the areas of high water iodine and the endemic areas of iodine excessgoiter
    水源性高碘地区和地方性高碘甲状腺肿病区的划定    		 China National Standards
    on
    English PDF
    GB/T 19378-2003 Nomenclature and codes for pesticide formulations
    农药剂型名称及代码    		 China National Standards
    on
    English PDF
    GB/T 14553-2003 Method of gas chromatographic for determination of organophosphorus pesticides in cereals，fruits and vegetables
    粮食、水果和蔬菜中有机磷农药测定的气相色谱法    		 China National Standards
    on
    English PDF
    GB/T 14552-2003 Method of gas chromatographic for determination of organophosphorus pesticides in water and soil
    水、土中有机磷农药测定的气相色谱法    		 China National Standards
    on
    English PDF
    GB/T 14551-2003 Method of gas chromatographicfor determination of BHC and DDT in animal and plant tissues
    动、植物中六六六和滴滴涕测定的气相色谱法    		 China National Standards
    on
    English PDF
    GB/T 14550-2003 Method of gas chromatographic fordetermination of BHC and DDT in soil
    土壤中六六六和滴滴涕测定的气相色谱法    		 China National Standards
    on
    English PDF
    GB 19377-2003 Parameters for degradation，sandification and salification of rangelands
    天然草地退化、沙化、盐渍化的分级指标    		 China National Standards
    on
    English PDF
    GB/T 6982-2003 Test methods for water vapor permeability of flexible containers
    软包装容器透湿度试验方法    		 China National Standards
    on
    English PDF
    GB/T 6981-2003 Test methods for water vapor transmission of rigid containers
    硬包装容器透湿度试验方法    		 China National Standards
    on
    English PDF
    GB 50342-2003 Technical code for concrete structure of TV tower
    混凝土电视塔结构技术规范    		 China National Standards
    on
    English PDF
    GB/T 6524-2003 Metallic powders--Determination of particle size distribution by gravitational sedimentation in a liquid and attenuation measurement
    金属粉末 粒度分布的测量 重力沉降光透法    		 China National Standards
    on
    English PDF
    GB/T 5153-2003 Designation and composition of wrought magnesium and magnesium alloys
    变形镁及镁合金牌号和化学成分    		 China National Standards
    on
    English PDF
    GB/T 15019-2003 Designation and classification of rapidly quenched metals
    快淬金属分类和牌号    		 China National Standards
    on
    English PDF
    GB/T 12608-2003 Thermal spraying--Wires，rods and cords for flame and arc spraying--Classification and technical supply condition
    热喷涂 火焰和电弧喷涂用线材、棒材和芯材 分类和供货技术条件    		 China National Standards
    on
    English PDF
    GB/T 7777-2003 Measurement and evaluation of mechanical vibration of displacement compressors
    容积式压缩机机械振动测量与评价    		 China National Standards
    on
    English PDF
    GB/T 9792-2003 Conversion coatings on metallic materials--Determination of coating mass per unit area--Gravimetric methods
    金属材料上的转化膜 单位面积膜质量的测定 重量法    		 China National Standards
    on
    English PDF
    GB/T 9791-2003 Chromate conversion coatings on zinc，cadmium，aluminium-zinc alloys and zinc-aluminium alloys--Test methods
    锌、镉、铝-锌合金和锌-铝合金的铬酸盐转化膜 试验方法    		 China National Standards
    on
    English PDF
    GB/T 5868-2003 Rolling bearings--Mounting dimensions
    滚动轴承 安装尺寸    		 China National Standards
    on
    English PDF
    GB/T 4980-2003 Determination of sound level for noise emitted by displacement compressors
    容积式压缩机噪声的测定    		 China National Standards
    on
    English PDF
    GB/T 4957-2003 Non-conductive coatings on non-magnetic basis metals--Measurement of coating thickness--Eddy current
    非磁性基体金属上非导电覆盖层 覆盖层厚度测量 涡流法    		 China National Standards
    on
    English PDF
    GB/T 4956-2003 Non-magnetic coatings on magnetic substrates--Measurement of coating thickness--Magnetic method
    磁性基体上非磁性覆盖层 覆盖层厚度测量 磁性法    		 China National Standards
    on
    English PDF
    GB/T 4140-2003 Flat-top chains and associated chain wheels for conveyors
    输送用平顶链和链轮    		 China National Standards
    on
    English PDF
    GB/T 19356-2003 Thermal spraying--Powders--Composition and technical supply conditions
    热喷涂 粉末 成分和供货技术条件    		 China National Standards
    on
    English PDF
    GB/T 19355-2003 Protection against corrosion ofiron and steel in structures--Zinc and aluminum coatings--Guidelines
    钢铁结构耐腐蚀防护 锌和铝覆盖层 指南    		 China National Standards
    on
    English PDF
    GB/T 19354-2003 Vitreous and porcelain enamels for aluminium--Determination of the adhesion of enamels on aluminium under the action of electrolytic solution (spall test)
    铝搪瓷 在电解液作用下铝上瓷层密着性的测定(剥落试验)    		 China National Standards
    on
    English PDF
    GB/T 19353-2003 Vitreous and porcelain enamels--Corrosion tests in closed systems
    搪玻璃釉 密闭系统中的腐蚀试验    		 China National Standards
    on
    English PDF
    GB/T 19352.1-2003 Thermal spraying--Quality requirements of thermally sprayed structures--Part 1:Guidance for selection and use
    热喷涂 热喷涂结构的质量要求 第1部分:选择和使用指南    		 China National Standards
    on
    English PDF
    GB/T 19351-2003 Metallic coatings--Determination of porosity in gold coatings on metal substrates--Nitric acid vapour test
    金属覆盖层 金属基体上金覆盖层孔隙率的测定 硝酸蒸汽试验    		 China National Standards
    on
    English PDF
    GB/T 19348.2-2003 Non-destructive testing--Industrial radiographic films--Part 2:Control of film processing by means of reference values
    无损检测 工业射线照相胶片 第2部分:用参考值方法控制胶片处理    		 China National Standards
    on
    English PDF

    Find out:38906Items   |  To Page of: First -Previous-Next -Last  | [333] [334] [335] [336] [337] [338] [339]

    　

    +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