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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. |
| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 5027-2007 |
Metallic materials - Sheet and strip - Determination of plastic strain ratio 金属材料 薄板和薄带塑性应变比（r值）的测定 |
China National Standards ratio |
 English PDF |
| GB/T 11276-2007 |
Surface active agents - Determination of the critical micellization concentration 表面活性剂 临界胶束浓度的测定 |
China National Standards ratio |
English PDF |
| GB/T 20485.21-2007 |
Methods for the calibration of vibration and shock transducers - Part 21: Vibration calibration by comparison to a reference transducer 振动与冲击传感器校准方法 第21部分：振动比较法校准 |
China National Standards ratio |
English PDF |
| GB/T 20485.13-2007 |
Methods for the calibration of vibration and shock transducers - Part 13: Primary shock calibration by laser interferometry 振动与冲击传感器校准方法 第13部分: 激光干涉法冲击绝对校准 |
China National Standards ratio |
English PDF |
| GB/T 18311.31-2007 |
Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 3-31: Examinations and measurements - Coupled power ratio measurement for fibre optic sources 纤维光学互连器件和无源器件 基本试验和测量程序 第3-31部分：检查和测量 纤维光学光源耦合功率比测量 |
China National Standards ratio |
English PDF |
| GB/T 14805.4-2007 |
Electronic data interchange for administration, commerce and transport (EDIFACT) - Application level syntax rules (Syntax version number: 4，Syntax release number:1) - Part 4: Syntax and service report message for batch EDI (Message type_CONTRL） 行政、商业和运输业电子数据交换（EDIFACT) 应用级语法规则(语法版本号:4，语法发布号:1) 第4部分: 批式电子数据交换语法和服务报告报文(报文类型为CONTRL) |
China National Standards ratio |
English PDF |
| GB/T 14805.3-2007 |
Electronic data interchange for administration, commerce and transport (EDIFACT) - Application level syntax rules (Syntax version number: 4，Syntax release number:1) - Part 3: Syntax rules specific to interactive EDI 行政、商业和运输业电子数据交换（EDIFACT) 应用级语法规则(语法版本号:4，语法发布号:1) 第3部分: 交互式电子数据交换专用的语法规则 |
China National Standards ratio |
English PDF |
| GB/T 14805.2-2007 |
Electronic data interchange for administration, commerce and transport (EDIFACT) - Application level syntax rules (Syntax version number: 4，Syntax release number:1) - Part 2: Syntax rules specific to batch EDI 行政、商业和运输业电子数据交换（EDIFACT) 应用级语法规则(语法版本号:4，语法发布号:1) 第2部分: 批式电子数据交换专用的语法规则 |
China National Standards ratio |
English PDF |
| GB/T 14805.1-2007 |
Electronic data interchange for administration,commerce andtransport (EDIFACT) - Application level syntax rules (Syntax version number: 4，Syntax release number:1) - Part 1: Syntax rules common to all parts 行政、商业和运输业电子数据交换(EDIFACT) 应用级语法规则(语法版本号: 4，语法发布号:1) 第1部分：公用的语法规则 |
China National Standards ratio |
English PDF |
| GB/T 8243.12-2007 |
Methods of test for full-flow lubricating oil filters for internal combustion engines - Part 12: Filtration efficiency using particle counting, and contaminant retention capacity 内燃机全流式机油滤清器试验方法 第12部分：采用颗粒计数法测定滤清效率和容灰量 |
China National Standards ratio |
English PDF |
| GB/T 7927-2007 |
Method of vibration measurement for walking tractors 手扶拖拉机 振动测量方法 |
China National Standards ratio |
English PDF |
| GB/T 12746-2007 |
Geotechnical engineering instrument for test penetration test apparatus 土工试验仪器 贯入仪 |
China National Standards ratio |
English PDF |
| GB 12641-2007 |
Safety requirements for handling and operation of audiovisual teaching equipment and syatems 教学视听设备及系统维护与操作的安全要求 |
China National Standards ratio |
English PDF |
| GB/T 15970.9-2007 |
Corrosion of metal and alloys - Stress corrosion testing - Part 9: Preparation and use of pre-cracked specimens for tests under rising load or rising displacement 金属和合金的腐蚀 应力腐蚀试验 第9部分：渐增式载荷或渐增式位移下的预裂纹试样的制备和应用 |
China National Standards ratio |
English PDF |
| GB/T 15970.6-2007 |
Corrosion of metals and alloys - Stress corrosion testing - Part 6: Preparation and use of pre-cracked specimens for tests under constant load or constant displacement 金属和合金的腐蚀 应力腐蚀试验 第6部分：恒载荷或恒位移下的预裂纹试样的制备和应用 |
China National Standards ratio |
English PDF |
| GB/T 7452-2007 |
Mechanical vibration - Guidelines for the measurement, reporting and evaluation of vibration with regard to habitability on passenger and merchant ships 机械振动 客船和商船适居性振动测量、报告和评价准则 |
China National Standards ratio |
English PDF |
| GB/T 13441.1-2007 |
Mechanical vibration and shock - Evaluation of human exposure to whole-body vibration - Part 1: General requirements 机械振动与冲击 人体暴露于全身振动的评价 第1部分: 一般要求 |
China National Standards ratio |
English PDF |
| GB 20904-2007 |
Horizontal directional drilling - Safety operation rules 水平定向钻机 安全操作规程 |
China National Standards ratio |
English PDF |
| GB/T 13876-2007 |
Agricultural wheeled tractors - Evalution criteria of whole body vibration of the operator 农业轮式拖拉机驾驶员全身振动的评价指标 |
China National Standards ratio |
English PDF |
| GB/T 13665-2007 |
Test method for damping capacity of metallic damping materials - Torsion pendulum method and Bending vibration 金属阻尼材料阻尼本领试验方法 扭摆法和弯曲振动法 |
China National Standards ratio |
English PDF |
| GB 10738-2007 |
Working chemical - General rules for assay - weight titration 工作基准试剂 含量测定通则 称量滴定法 |
China National Standards ratio |
English PDF |
| GB 10737-2007 |
Working chemical - General rules for assay - Weight titration（potentiometric method） 工作基准试剂 含量测定通则 称量电位滴定法 |
China National Standards ratio |
English PDF |
| GB 20826-2007 |
Code of safety for the use of high pressure water jetting operation by divers 潜水员高压水射流作业安全规程 |
China National Standards ratio |
English PDF |
| GB/T 20777-2006 |
Paints and varnishes - Examination and prepration of samples for testing 色漆和清漆 试样的检查和制备 |
China National Standards ratio |
English PDF |
| GB/T 8243.7-2006 |
Methods of test for full-flow lubricating oil filters for internal combustion engines - Part 7: Vibration fatigue test 内燃机全流式机油滤清器试验方法 第7部分:振动疲劳试验 |
China National Standards ratio |
English PDF |
| GB/T 20720.2-2006 |
Enterprise-control system integration - Part 2: Object model attributes 企业控制系统集成 第2部分：对象模型属性 |
China National Standards ratio |
English PDF |
| GB/T 20720.1-2006 |
Enterprise-control system integration - Part 1: Models and terminology 企业控制系统集成 第1部分：模型和术语 |
China National Standards ratio |
English PDF |
| GB/T 20719.1-2006 |
Industrial automation system and integration - Process specification language - Part 1: Overview and basic principles 工业自动化系统与集成 过程规范语言 第1部分:概述与基本原理 |
China National Standards ratio |
English PDF |
| GB/T 19903.10-2006 |
Industrial automation systems and integration - Physical device control - Data model for computerized numerical controllers - Part 10: General process data 工业自动化系统与集成 物理设备控制 计算机数值控制器用的数据模型 第10部分：通用工艺数据 |
China National Standards ratio |
English PDF |
| GB/T 19902.3-2006 |
Industrial automation systems and integration - Manufacturing software capability profiling for interoperability - Part 3: Interface services,protocols and capability templates 工业自动化系统与集成 制造软件互操作性能力建规 第3部分：接口服务、协议及能力模板 |
China National Standards ratio |
English PDF |
| GB/T 19659.4-2006 |
Industrial automation systems and integration - Open systems application integration framework - Part 4: Reference description for Ethernet-based control systems 工业自动化系统与集成 开放系统应用集成框架 第4部分：基于以太网控制系统的参考描述 |
China National Standards ratio |
English PDF |
| GB/T 19659.3-2006 |
Industrial automation systems and integration - Open systems application integration framework - Part 3: Reference description for IEC 61158-based control systems 工业自动化系统与集成 开放系统应用集成框架 第3部分：基于IEC 61158控制系统的参考描述 |
China National Standards ratio |
English PDF |
| GB/T 19659.2-2006 |
Industrial automation systems and integration - Open systems application integration framework - Part 2: Reference description for ISO 11898-based control systems 工业自动化系统与集成 开放系统应用集成框架 第2部分：基于ISO 11898的控制系统的参考描述 |
China National Standards ratio |
English PDF |
| GB 20664-2006 |
Limitation concentration of natural radioactivity in non-ferrous metal ores and concentrates products 有色金属矿产品的天然放射性限值 |
China National Standards ratio |
English PDF |
| GB/T 8910.6-2006 |
Hand-held portable power tools - Measurements of vibrations at the handle - Part 6: Impact drills 手持便携式动力工具 手柄振动测量方法 第6部分: 冲击钻 |
China National Standards ratio |
English PDF |
| GB/T 2423.56-2006 |
Environmental testing for electric and electronic products - Part 2: Test methods - Test Fh: Vibration、broad-band random(digital control) and guidance 电工电子产品环境试验 第2部分：试验方法 试验Fh：宽带随机振动（数字控制）和导则 |
China National Standards ratio |
English PDF |
| GB/T 6730.46-2006 |
Iron ores - Determination of arsenic content - Arseno-molybdenum blue spectrophotometric method after the distillation separation 铁矿石 砷含量的测定 蒸馏分离-砷钼蓝分光光度法 |
China National Standards ratio |
English PDF |
| GB/T 6730.45-2006 |
Iron ores - Determination of arsenic content - Arseno-molybdenum blue spectrophotometric method after hydrogen arsenide separation 铁矿石 砷含量的测定 砷化氢分离-砷钼蓝分光光度法 |
China National Standards ratio |
English PDF |
| GB/T 19256.2-2006 |
Electronic business eXtensible Markup Language(ebXML) - Part 2: Collaboration-Protocol Profile and agreement specification(ebCPP) 基于XML的电子商务 第2部分：协同规程轮廓与协议规范 |
China National Standards ratio |
English PDF |
| GB/T 20485.11-2006 |
Methods for the calibration of vibration and shock transducers - Part 11: Primary vibration calibration by laser interferometry 振动与冲击传感器校准方法 第11部分：激光干涉法振动绝对校准 |
China National Standards ratio |
English PDF |
| GB/T 1509-2006 |
Manganese ores - Determination of silicon content - Perchloric acid dehydration gravimetric method 锰矿石 硅含量的测定 高氯酸脱水重量法 |
China National Standards ratio |
English PDF |
| GB/T 9239.2-2006 |
Mechanical vibration - Balance quality requirements for rotors in a constant (rigid) state - Part 2: Balance errors 机械振动 恒态(刚性)转子平衡品质要求 第2部分:平衡误差 |
China National Standards ratio |
English PDF |
| GB/T 9239.1-2006 |
Mechanical vibration - Balance quality requirements for rotors in a constant (rigid) state - Part 1: Specification and verification of balance tolerances 机械振动 恒态（刚性）转子平衡品质要求 第1部分：规范与平衡允差的检验 |
China National Standards ratio |
English PDF |
| GB/T 11349.3-2006 |
Vibration and shock - Experimental determination of mechanical mobility - Part 3: Measurement using impact excitation 振动与冲击 机械导纳的试验确定 第3部分：冲击激励法 |
China National Standards ratio |
English PDF |
| GB/T 27050.2-2006 |
Conformity assessment―Supplier’s declaration of conformity―Part 2: Supporting documentation 合格评定 供方的符合性声明 第2部分：支持性文件 |
China National Standards ratio |
English PDF |
| GB/T 27050.1-2006 |
Conformity assessment―Supplier’s declaration of conformity―part 1: General requirements 合格评定 供方的符合性声明 第1部分：通用要求 |
China National Standards ratio |
English PDF |
| GB/T 8152.4-2006 |
Methods for chemical analysis of lead concentrates―Determination of zinc content―EDTA titration method 铅精矿化学分析方法 锌量的测定 EDTA滴定法 |
China National Standards ratio |
English PDF |
| GB/T 8152.2-2006 |
Methods for chemical analysis of lead concentrates―Determination of lead content―Back titration of EDTA after precipitation of lead sulfate 铅精矿化学分析方法 铅量的测定 硫酸铅沉淀―EDTA返滴定法 |
China National Standards ratio |
English PDF |
| GB/T 8152.1-2006 |
Methods for chemical analysis of lead concentrates―Determination of lead content―EDTA titration method after acid digestion 铅精矿化学分析方法 铅量的测定 酸溶解-EDTA滴定法 |
China National Standards ratio |
English PDF |
| GB/T 7178.2-2006 |
The operating for railway shunting―Part 2: Preparing operation 铁路调车作业 第2部分：准备作业 |
China National Standards ratio |
English PDF |
| GB/T 6434-2006 |
Feeding stuffs―Determination of crude fiber content Method with intermediate filtration 饲料中粗纤维的含量测定 过滤法 |
China National Standards ratio |
English PDF |
| GB/T 4464-2006 |
Dyestuff - Determination of migration 染料 泳移性的测定 |
China National Standards ratio |
English PDF |
| GB/T 2401-2006 |
Cationic dyes - Determination of fiber saturation value、dye saturation value and saturation factor in acrylic dyeing 阳离子染料 染腈纶时纤维饱和值、染料饱和值及饱和因数的测定 |
China National Standards ratio |
English PDF |
| GB/Z 20347-2006 |
Powered lawn,garden and horticultural equipment - Operator controls - Actuating forces,displacement,location and methods of operation 草坪和园艺动力机械 操作者操纵机构 操纵力、位移量、操纵位置和方法 |
China National Standards ratio |
English PDF |
| GB/T 20341-2006 |
Tractors and self-propelled machinery for agriculture and forestry - Operator Controls - Actuating forces,displacement,location and method of operation 农林拖拉机和自走式机械 操作者操纵机构 操纵力、位移量、操纵位置和方法 |
China National Standards ratio |
English PDF |
| GB 8276-2006 |
Food additive - Glucoamylase preperation 食品添加剂 糖化酶制剂 |
China National Standards ratio |
English PDF |
| GB 20713-2006 |
Food additive - a-acetolactate decarboxylase preparation 食品添加剂 a-乙酰乳酸脱羧酶制剂 |
China National Standards ratio |
English PDF |
| GB/T 13466-2006 |
The general principles of economic operation for AC driven fan (pump, air compressor) system 交流电气传动风机（泵类、空气压缩机）系统经济运行通则 |
China National Standards ratio |
English PDF |
| GB/T 12497-2006 |
Three-phase induction motor“s economic operation 三相异步电动机经济运行 |
China National Standards ratio |
English PDF |
| GB/T 8757-2006 |
Determination of carrier concentration in gallium arsenide by the plasma resonance minimum 砷化镓中载流子浓度等离子共振测量方法 |
China National Standards ratio |
English PDF |
| GB/T 11068-2006 |
Gallium arsenide epitaxial layer - determination of carrier concentration voltage-capacitance method 砷化镓外延层载流子浓度电容-电压测量方法 |
China National Standards ratio |
English PDF |
| GB/T 6988.5-2006 |
Preparation of documents used in electrotechnology - Part 5: Index 电气技术用文件的编制 第5部分：索引 |
China National Standards ratio |
English PDF |
| GB/T 13092-2006 |
Enumeration of molds count in feeds 饲料中霉菌总数的测定 |
China National Standards ratio |
English PDF |
| GB/T 20381-2006 |
Technical rules for construction of merchantable volume ratio tables 材种出材率表编制技术规程 |
China National Standards ratio |
English PDF |
| GB/T 11349.2-2006 |
Vibration and shock - Experimental determination of mechanical mobility - Part 2: Measurements using single-point translation excitation with an attached vibration exciter 振动与冲击 机械导纳的试验确定 第2部分：用激振器作单点平动激励测量 |
China National Standards ratio |
English PDF |
| GB/T 11349.1-2006 |
Vibration and shock - Experimental determination of mechanical mobility - Part 1: Basic definitions and transducers 振动与冲击 机械导纳的试验确定 第1部分：基本定义与传感器 |
China National Standards ratio |
English PDF |
| GB/T 20247-2006 |
Acoustics - Measurement of sound absorption in a reverberation room 声学 混响室吸声测量 |
China National Standards ratio |
English PDF |
| GB/T 20176-2006 |
Surface chemical analysis-Secondary-ion mass spectrometry-Determination of boron atomic concentration in silicon using uniformly doped materials 表面化学分析 二次离子质谱 用均匀掺杂物质测定硅中硼的原子浓度 |
China National Standards ratio |
English PDF |
| GB/T 6038-2006 |
Rubber test mixes―Preparation，mixing and vulcanization―Equipment and procedures 橡胶试验胶料 配料、混炼和硫化设备及操作程序 |
China National Standards ratio |
English PDF |
| GB/T 20158-2006 |
Information technology - Software life cycle process- Configuration management 信息技术 软件生存周期过程 配置管理 |
China National Standards ratio |
English PDF |
| GB/T 19979.2-2006 |
Geosynthetics - Penetration-resist property - Part 2: Determination of penetration coefficient 土工合成材料 防渗性能 第2部分 渗透系数的测定 |
China National Standards ratio |
English PDF |
| GB/T 20199-2006 |
Surface active agents - Technical alkane sulfonates - Determination of alkane monosulfonates content by direct two-phase titration 表面活性剂-工业烷烃磺酸盐-烷烃单磺酸盐含量的测定（直接两相滴定法） |
China National Standards ratio |
English PDF |
| GB/T 6910-2006 |
Methods for analysis of water for boiler and for cooling determination of calcium-complexometric titration 锅炉用水和冷却水分析方法 钙的测定 络合滴定法 |
China National Standards ratio |
English PDF |
| GB/T 20143-2006 |
Procedure for use in the preparation of maximum lamp outlines 灯最大外形尺寸图的制定程序 |
China National Standards ratio |
English PDF |
| GB/T 20140-2006 |
Dynamic characteristic and vibration measurement method of turbo-generators on stator windings and evaluation criteria 透平型发电机定子绕组端部动态特性和振动试验方法及评定 |
China National Standards ratio |
English PDF |
| GB/T 20127.8-2006 |
Steel and alloy - Determination of trace element contents Part 8: Determination of antimony content by hydride generation-atomic fluorescence spectrometric method 钢铁及合金 痕量元素的测定 第8部分：氢化物发生-原子荧光光谱法测定锑含量 |
China National Standards ratio |
English PDF |
| GB/T 20127.5-2006 |
Steel and alloy - Determination of trace element contents Part 5: Determination of gallium content by extraction separation-rhodamine B photometric method 钢铁及合金 痕量元素的测定 第5部分：萃取分离-罗丹明B光度法 测定镓含量 |
China National Standards ratio |
English PDF |
| GB/T 20127.2-2006 |
Steel and alloy - Determination of trace element contents Part2: Determination of arsenic content by hydride generation-atomic fluorescence spectrometric method 钢铁及合金 痕量元素的测定 第2部分：氢化物发生-原子荧光光谱法 测定砷含量 |
China National Standards ratio |
English PDF |
| GB/T 20127.10-2006 |
Steel and alloy - Determination of trace element contents Part 10: Determination of selenium content by hydride generation-atomic fluorescence spectrometric method 钢铁及合金 痕量元素的测定 第10部分：氢化物发生-原子荧光光谱法测定硒含量 |
China National Standards ratio |
English PDF |
| GB/T 20122-2006 |
Corrosion of metals and alloys -- Evaluation of stress corrosion cracking by the drop evaporation test 金属和合金的腐蚀 滴落蒸发试验的应力腐蚀开裂评价 |
China National Standards ratio |
English PDF |
| GB/T 20131-2006 |
Calibration and usage of α/β gas proportional counters α/β流气式正比计数器的标定和使用 |
China National Standards ratio |
English PDF |
| GB/T 20195-2006 |
Animal feeding stuffs - Preparation of test samples 动物饲料 试样的制备 |
China National Standards ratio |
English PDF |
| GB/T 20117-2006 |
Fine ceramics (advanced ceramics, advanced technical ceramics) - Sample preparation for the determination of particle size distribution of ceramic powders 精细陶瓷粉体颗粒尺寸分布测试用样品的制备 |
China National Standards ratio |
English PDF |
| GB/T 20103-2006 |
Technical terms for membrane separation 膜分离技术 术语 |
China National Standards ratio |
English PDF |
| GB/T 3787-2006 |
Technical safety code for management, operation, inspection and maintenance of hand-held motor-operated electric tools 手持式电动工具的管理、使用、检查和维修安全技术规程 |
China National Standards ratio |
English PDF |
| GB 13078.2-2006 |
Hygienical standard for in feeds Toleration of ochratoxin A and zearalenone in feeds 饲料卫生标准 饲料中赭曲霉毒素A和玉米赤霉烯酮的允许量 |
China National Standards ratio |
English PDF |
| GB/T 20099-2006 |
Sample preparation - Dispersing procedures for powders in liquids 样品制备-粉末在液体中的分散方法 |
China National Standards ratio |
English PDF |
| GB/T 20066-2006 |
Steel and iron -- Sampling and preparation of samples for the determination of chemical composition 钢和铁 化学成分测定用试样的取样和制样方法 |
China National Standards ratio |
English PDF |
| GB/T 20417.2-2006 |
Plastics―Acrylonitrile-butadiene-styrene(ABS)moulding and extrusion materials―Part 2: Preparation of test specimens and determination of properties 塑料 丙烯腈-丁二烯-苯乙烯 (ABS) 模塑和挤出材料 第2部分:试样制备和性能测定 |
China National Standards ratio |
English PDF |
| GB/T 1845.2-2006 |
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 ratio |
English PDF |
| GB/T 20370-2006 |
Biocatalyst Guideline for enzyme preparation nomenclature 生物催化剂 酶制剂-分类导则 |
China National Standards ratio |
English PDF |
| GB/T 20061-2006 |
Test method and judgment of anti-deflagration property of permissible explosive 煤矿许用炸药抗爆燃性能测试方法及判定 |
China National Standards ratio |
English PDF |
| GB/T 20176-2006 |
Surface chemical analysis-Secondary-ion mass spectrometry-Determination of boron atomic concentration in silicon using uniformly doped materials 表面化学分析 二次离子质谱 用均匀掺杂物质测定硅中硼的原子浓度 |
China National Standards ratio |
English PDF |
| GB 50365-2005 |
Code for operation and management of central air conditioning system 空调通风系统运行管理规范 |
China National Standards ratio |
English PDF |
| GB/T 19979.1-2005 |
Geosynthetics-Penetration resist Property-Part1:Determination of Static Hydraulic Pressure 土木合成材料 防渗性能 第1部分: 耐静水压的测定 |
China National Standards ratio |
English PDF |
| GB/T 2900.68-2005 |
Electrotechnical Terminology Telecommunication Networks,Teletraffic and Operation 电工术语 电信网、电信业务和运行 |
China National Standards ratio |
English PDF |
| GB/T 12032-2005 |
Paper and board-preparation of a offset print for test gloss 纸和纸板 印刷光泽度印样的制备 |
China National Standards ratio |
English PDF |
| GB/T 6404.2-2005 |
Acceptance code for gear units-Part2:Determination of mechanical vibrations of gear units during acceptance testing 齿轮装置的验收规范 第2部分：验收试验中齿轮装置机械振动的测定 |
China National Standards ratio |
English PDF |
| GB/T 1883.1-2005 |
Reciprocating internal combustion engines-Vocabulary-Part 1:Terms for engine design and operation 往复式内燃机 词汇 第1部分：发动机设计和运行术语 |
China National Standards ratio |
English PDF |
| GB/T 3903.11-2005 |
Footwear-Test methods for insoles,lining and insocks-perspiration resistance 鞋类-内底、衬里和内垫试验方法-耐汗性 |
China National Standards ratio |
English PDF |
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