中華人民共和國國家標準(中國大陸GB標準)英文版 |
GB標準是中華人民共和國國家標準,也叫GB國標,是中國大陸強制執行的國家標準,所有中國大陸境內銷售的商品及提供服務都必須符合GB國家標準的要求,包括進口商品及服務; 本網站提供GB國家標準的查詢檢索,英文版翻譯,GB標準產品檢測檢驗及合規性分析服務; |
GB/T 28708-2012 管道工程用无缝及焊接钢管尺寸选用规定(中英文版) Specification for size selection of seamless and welded steel pipe used in piping engineering |
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GB/T 28430-2012 数字电视系统数据广播技术规范(中英文版) Technical specification of data broadcasting in digital television system |
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GB/T 28505-2012 国内No.7信令方式技术要求 2Mbit/s高速信令链路(中英文版) Technical specification of national No.7 signaling system 2Mbit/s high speed link |
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GB/T 13399-2012 汽轮机安全监视装置 技术条件(中英文版) Specification for safety monitoring devices of steam turbine |
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GB/T 28584-2012 城市坐标系统建设规范(中英文版) Specifications for the establishment of urban coordinate system |
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GB/T 28292-2012 钢铁工业含铁尘泥回收及利用技术规范(中英文版) The technical specification for recycling and utilization of Fe-bearing dusts and sludges in iron and steel industry |
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GB/T 28282-2012 计算机辅助工艺设计 系统功能规范(中英文版) Specification for function of computer aided process planning system |
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GB/T 27678-2011 湿法炼锌企业废水循环利用技术规范(中英文版) The technical specification of waste water recycle fo hydrometallurgical zinc enterprise |
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GB/T 17850.11-2011 涂覆涂料前钢材表面处理 喷射清理用非金属磨料的技术要求 第11部分:钢渣特种型砂(中英文版) Preparation of steel substrates before application of paints and related products - Specifications for non-metallic blast-cleaning abrasives - Part 11: Special type grit of steel slag |
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GB/T 17850.6-2011 涂覆涂料前钢材表面处理 喷射清理用非金属磨料的技术要求 第6部分:炼铁炉渣(中英文版) Preparation of steel substrates before application of paints and related products - Specifications for non-metallic blast-cleaning abrasives - Part 6: Iron furnace slag |
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GB/T 27866-2011 控制钢制管道和设备焊缝硬度防止硫化物应力开裂技术规范(中英文版) Specification of controlling weld hardness of carbon steel and low alloy steel piping and equipment to prevent sulfide stress cracking |
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GB/T 27553.2-2011 塑料-青铜-钢背三层复合自润滑板材技术条件 第2部分:带改性聚甲醛(POM)减摩层的板材(中英文版) Specification of plastics-bronze-steel backing triplelayer self-lubricating materials - Part 2:plastic overlay with modified POM |
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GB/T 27553.1-2011 塑料-青铜-钢背三层复合自润滑板材技术条件 第1部分:带改性聚四氟乙烯(PTFE)减摩层的板材(中英文版) Specification of Plastics-Bronze-steel backing triplelayer self-lubricating materials - Part 1:plastic overlay with modified PTFE |
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GB/T 27522-2011 畜禽养殖污水采样技术规范(中英文版) Technical specifications for waste water sampling of livestock and poultry farm |
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GB/T 28035-2011 软件系统验收规范(中英文版) Software system acceptance specification |
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GB/T 28012-2011 报废照明产品 回收处理规范(中英文版) Specification of waste lighting products recycling and disposal |
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GB/T 26973-2011 空气源热泵辅助的太阳能热水系统(储水箱容积大于0.6m3)技术规范(中英文版) Specification of solar water heating systems assisted with air-source heat pump(for capacity of water tank more than 0.6 m3) |
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GB/T 19141-2011 家用太阳能热水系统技术条件(中英文版) Specification of domestic solar water heating systems |
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GB/T 26866-2011 电力系统的时间同步系统检测规范(中英文版) Testing specifications of time synchronism systems for power system |
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GB/T 26805.4-2011 工业控制计算机系统 软件 第4部分:工程化文档规范(中英文版) Industrial control computer system - Software - Part 4: Engineering document specification |
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GB/T 26759-2011 中央空调水系统节能控制装置技术规范(中英文版) The technical specification for energy-saving control device for water system of central air-conditioning |
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GB/T 26624-2011 畜禽养殖污水贮存设施设计要求(中英文版) Design specifications for wastewater storage facility of animal farm |
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GB/T 26679-2011 机床电气、电子和可编程电子控制系统 保护联结电路连续性试验规范(中英文版) Electrical ,electronic and programmable electronic control systems of machine tools - Specification of the continuity of the protective bonding circuit test |
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GB/T 26676-2011 机床电气、电子和可编程电子控制系统 耐压试验规范(中英文版) Electrical, electronic and programmable electronic control systems of machine tools - Specification of withstanding voltage test |
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GB/T 26675-2011 机床电气、电子和可编程电子控制系统 绝缘电阻试验规范(中英文版) Electrical,electronic and programmable electronic control systems of machine tools - Specification of insulation resistance test |
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GB/T 26205-2010 制冷空调设备和系统 减少卤代制冷剂排放规范(中英文版) Refrigerating and air-conditioning equipment and systems - Specification for reducing the release of halogenated refrigerants |
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GB/Z 26157.7-2010 测量和控制数字数据通信 工业控制系统用现场总线 类型2:ControlNet和EtherNet/IP规范 第7部分:设备行规(中英文版) Digital data communication for measurement and control - Fieldbus for use in industrial control systems - Type 2: ControlNet and EtherNet/IP specification - Part 7: Device profiles |
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GB/T 26335-2010 工业企业信息化集成系统规范(中英文版) Specification of industry enterprise informationization integration system |
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GB/T 17178.6-2010 信息技术 开放系统互连 一致性测试方法和框架 第6部分:协议轮廓测试规范(中英文版) Information technology - Open system interconnection - Conformance testing methodology and framework - Part 6: Protocol profile test specification |
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GB/T 25969-2010 家用太阳能热水系统主要部件选材通用技术条件(中英文版) Specification of material selecting for main parts of domestic solar water heating system |
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GB/T 25966-2010 带电辅助能源的家用太阳能热水系统技术条件(中英文版) Specification of domestic solar water heating systems with electrical auxiliary heat source |
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GB/T 25932-2010 铸造高温合金母合金通用技术条件(中英文版) General specification of superalloy master alloys for castings |
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GB/T 25489-2010 网络化制造系统功能规划技术规范(中英文版) Technical specification for the functional planning of networked manufacturing system |
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GB/T 16676-2010 银行安全防范报警监控联网系统技术要求(中英文版) Specification of alarm and monitoring network system for bank security and protection |
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GB/T 25350-2010 使用乙醇汽油车辆燃油供给系统清洗工艺规范(中英文版) Technology specification for cleaning fuel supply system of ethanol gasoline vehicles |
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GB 16669-2010 二氧化碳灭火系统及部件通用技术条件(中英文版) General technical specifications for components of carbon dioxide fire extinguishing systems |
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GB/T 25056-2010 信息安全技术 证书认证系统密码及其相关安全技术规范(中英文版) Information security techniques - Specifications of cryptograph and related security technology for certificate authentication system |
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GB/Z 24841-2009 1000kV交流系统用电容式电压互感器技术规范(中英文版) Technical specification for capacitor voltage transformers of 1000kV ac system |
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GB/Z 24840-2009 1000kV交流系统用套管技术规范(中英文版) Technical specification for bushing of 1000kV ac system |
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GB/Z 24839-2009 1000kV交流系统用支柱绝缘子技术规范(中英文版) Technical specification of post insulators for 1000kV a.c. system |
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GB/T 24716-2009 公路沿线设施太阳能供电系统通用技术规范(中英文版) General specifications of solar energy power system for highway facilities |
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GB/Z 24845-2009 1000kV交流系统用无间隙金属氧化物避雷器技术规范(中英文版) Specification of metal-oxide surge arresters without gaps for 1000kV ac system |
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GB/T 24652-2009 轮式拖拉机转向摇臂 技术条件(中英文版) Steering rocking arm of wheeled tractors - Specifications |
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GB/T 24649.5-2009 拖拉机挂车气制动系统制动气室 技术条件(中英文版) Brake chamber of pneumatic braking system of tractor-trailers - Specifications |
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GB/T 24649.4-2009 拖拉机挂车气制动系统气制动阀 技术条件(中英文版) Brake valve of pneumatic braking system of tractor-trailers - Specifications |
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GB/T 24649.3-2009 拖拉机挂车气制动系统空气压缩机 技术条件(中英文版) Air compressor of pneumatic braking system of tractor-trailers - Specifications |
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GB/T 24649.2-2009 拖拉机挂车气制动系统分配阀 技术条件(中英文版) Distributor of pneumatic braking system of tractor-trailers - Specifications |
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GB/T 24649.1-2009 拖拉机挂车气制动系统储气筒 技术条件(中英文版) Air reservoir of pneumatic braking system of tractor-trailers - Specifications |
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GB/T 23889-2009 家用空气源热泵辅助型太阳能热水系统技术条件(中英文版) Specifications of air source heat pump assisted domestic solar water heating systems |
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GB/T 23701-2009 人-系统交互人类工效学 人-系统事宜的过程评估规范(中英文版) Ergonomics of human-system interaction - Specification for the process assessment of human-system issues |
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GB/T 23685-2009 废电器电子产品回收利用通用技术要求(中英文版) General technical specifications of recovering for waste electrical and electronic equipment |
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GB/T 23392.3-2009 十字花科蔬菜病虫害测报技术规范 第3部分:小菜蛾(中英文版) Technical specification for the forecast of diseases and insects on cruciferous plants - Part 3: Plutella xylostella linnaeus |
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GB/T 13149-2009 钛及钛合金复合钢板焊接技术要求(中英文版) Specification for welding of titanium and titanium alloy clad steel plates |
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GB/T 13147-2009 铜及铜合金复合钢板焊接技术要求(中英文版) Specification for welding of copper and copper alloy clad steel plates |
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GB/T 23270.2-2009 信息与文献 开放系统互连 馆际互借应用协议规范 第2部分:协议实施一致性声明(PICS)条文(中英文版) Information and documentation - Open systems interconnection - Interlibrary loan application protocol specification - Part 2: Protocol implementation conformance statement (PICS) proforma |
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GB/T 16453.2-2008 水土保持综合治理 技术规范 荒地治理技术(中英文版) Technical specification for comprehensive control of soil and water conservation - Technique for erosion control of waste land |
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GB/T 18159-2008 滑行车类游艺机通用技术条件(中英文版) Specifications of amusement rides coaster category |
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GB/T 14173-2008 水利水电工程钢闸门制造、安装及验收规范(中英文版) Specification for manufacture, installation and acceptance of steel gate in hydraulic and hydroelectric engineering |
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GB/T 22395-2008 锅炉钢结构设计规范(中英文版) Specification for design of boiler steel structures |
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GB/T 11920-2008 电站电气部分集中控制设备及系统通用技术条件(中英文版) General specification of central control equipment and system for electrical parts in power stations and substations |
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GB/T 22385-2008 大坝安全监测系统验收规范(中英文版) Specification for acceptance of dam safety monitoring system |
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GB/T 22384-2008 电力系统安全稳定控制系统检验规范(中英文版) Testing specification of security and stability control system for power system |
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GB/T 18038-2008 电气化铁道牵引供电系统微机保护装置通用技术条件(中英文版) General specification of microprocessor-based protection equipment for electrified railway traction power supply system |
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GB/T 15148-2008 电力负荷管理系统技术规范(中英文版) Technical specification of power load management system |
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GB/T 10417-2008 碳化钨钢结硬质合金技术条件及其力学性能的测试方法(中英文版) Specifications for steel-bonded tungsten carbides and determination of its transverse rupture strength, impact toughness and hardness |
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GB/T 22241-2008 船用细水雾灭火系统通用技术条件(中英文版) General specification for water mist fire extinguishing system of ship |
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GB/T 13148-2008 不锈钢复合钢板焊接技术要求(中英文版) Specification for welding of stainless steel clad plate |
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GB/T 14714-2008 微小型计算机系统设备用开关电源通用规范(中英文版) General specification of switching power supply for mini-micro computer system |
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GB/T 1592.1-2008 农业拖拉机后置动力输出轴 1、2和 3 型 第 1 部分:通用要求、安全要求、防护罩尺寸和空隙范围(中英文版) Agricultural tractors - Rear- mounted power take-off types 1,2 and 3 - Part 1: General specifications, safety requirements, dimensions for master shield and clearance zone |
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GB/T 1631-2008 离子交换树脂命名系统和基本规范(中英文版) Designation system and basis for specifications of ion exchange resins |
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GB/T 11805-2008 水轮发电机组自动化元件(装置)及其系统基本技术条件(中英文版) Basic specifications of automatic control components (devices) and their related system for hydroturbine-generating sets |
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GB/T 22023-2008 液体食品超高温瞬时灭菌(UHT)设备验收规范(中英文版) Acceptance specification of ultra high temperature sterilizing equipment for liquid food |
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GB/T 21741-2008 住宅小区安全防范系统通用技术要求(中英文版) General specifications of security & protection system for residential area |
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GB/T 13314-2008 锻钢冷轧工作辊 通用技术条件(中英文版) General specifications of forged steel work rolls for cold rolling |
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GB/T 18838.4-2008 涂覆涂料前钢材表面处理 喷射清理用金属磨料的技术要求 第4部分: 低碳铸钢丸(中英文版) Preparation of steel substrates before application of paints and related products-Specifications for metallic blast-cleaning abrasives - Part 4:Low-carbon cast-steel shot |
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GB/T 18838.3-2008 涂覆涂料前钢材表面处理 喷射清理用金属磨料的技术要求 第3部分: 高碳铸钢丸和砂(中英文版) Preparation of steel substrates before application of paints and related products-Specifications for metallic blast-cleaning abrasives - Part 3: High-carbon cast-steel shot and grit |
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GB/T 13288.1-2008 涂覆涂料前钢材表面处理 喷射清理后的钢材表面粗糙度特性 第1部分: 用于评定喷射清理后钢材表面粗糙度的ISO表面粗糙度比较样块的技术要求和定义(中英文版) Preparation of steel substrates before application of paints and related products-Surface roughness characteristics of blast-cleaned substrates - Part 1: Specifications and definitions for ISO surface profile comparators for the assessment of abrasive bl |
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GB/T 17472-2008 微电子技术用贵金属浆料规范(中英文版) Specification for pastes of precious metal used for microelectronics |
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GB/T 21448-2008 埋地钢质管道阴极保护技术规范(中英文版) Specification of cathodic protection for underground steel pipelines |
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GB/T 12920-2008 船用气动系统通用技术条件(中英文版) General specification for pneumatic system of ship |
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GB/T 21368-2008 钢铁企业能源计量器具配备和管理要求(中英文版) Specification for equipping and managing of measuring instrument of energy in the iron and steel industry |
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GB/T 21195-2007 移动通信室内信号分布系统 天线技术条件(中英文版) The specifications of antenna for mobile communication indoor distributed system |
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GB/T 21247-2007 海面溢油鉴别系统规范(中英文版) Specifications for identification system of spilled oil on the sea |
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GB/T 19668.5-2007 信息化工程监理规范 第5部分: 软件工程监理规范(中英文版) Information system project surveillance specification - Part 5: Software project surveillance specification |
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GB/T 21056-2007 风机、泵类负载变频调速节电传动系统及其应用技术条件(中英文版) Specification for adjustable speed drive systems of electricity conservation with VF for fans and pumps |
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GB/T 21024-2007 中文语音合成系统通用技术规范(中英文版) General specification of Chinese speech synthesis system |
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GB/T 9652.1-2007 水轮机控制系统技术条件(中英文版) Specifications of control systems for hydraulic turbines |
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GB/T 12228-2006 通用阀门 碳素钢锻件技术条件(中英文版) General purpose industrial valves - Specification of carbon steel forgings |
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GB/T 20630.2-2006 聚酯纤维机织带规范 第2部分:试验方法(中英文版) Specification for polyester fibre woven tapes - Part 2: Methods of test |
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GB/T 20627.2-2006 玻璃及玻璃聚酯纤维机织带规范 第2部分:试验方法(中英文版) Specification for glass and glass polyester fibre woven tapes - Part 2: Methods of test |
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GB/T 20540.6-2006 测量和控制数字数据通信 工业控制系统用现场总线 类型3:PROFIBUS规范 第6部分:应用层协议规范(中英文版) Digital data communication for measurement and control - Fieldbus for use in industrial systems Type 3: PROFIBUS specification - Part 6: Application layer protocol specification |
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GB/T 20540.1-2006 测量和控制数字数据通信 工业控制系统用现场总线 类型3:PROFIBUS规范 第1部分:概述和导则(中英文版) Digital data communication for measurement and control - Fieldbus for use in industrial systems Type 3: PROFIBUS specification - Part 1: Overview and guidance |
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GB/T 20540.2-2006 测量和控制数字数据通信 工业控制系统用现场总线 类型3:PROFIBUS规范 第2部分:物理层规范和服务定义(中英文版) Digital data communication for measurement and control - Fieldbus for use in industrial systems Type 3: PROFIBUS specification - Part 2: Physical layer specification and service definition |
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GB/T 20540.3-2006 测量和控制数字数据通信 工业控制系统用现场总线 类型3:PROFIBUS规范 第3部分:数据链路层服务定义(中英文版) Digital data communication for measurement and control - Fieldbus for use in industrial systems Type 3: PROFIBUS specification -Part 3: Data link layer service definition |
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GB/T 20540.5-2006 测量和控制数字数据通信 工业控制系统用现场总线 类型3:PROFIBUS规范 第5部分:应用层服务定义(中英文版) Digital data communication for measurement and control - Fieldbus for use in industrial systems Type 3: PROFIBUS specification - Part 5: Application layer service definition |
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GB/Z 20541.1-2006 测量和控制数字数据通信 工业控制系统用现场总线 类型10:PROFINET规范 第1部分:应用层服务定义(中英文版) Digital data communication for measurement and control - Fieldbus for use in industrial control systems Type 10:PROFINET Specification - Part 1: Application layer service definition |
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GB/Z 20541.2-2006 测量和控制数字数据通信 工业控制系统用现场总线 类型10:PROFINET规范 第2部分:应用层协议规范(中英文版) Digital data communication for measurement and control - Fieldbus for use in industrial control systems Type 10:PROFINET Specification - Part 2: Application Layer protocol specification |
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GB/T 20540.4-2006 测量和控制数字数据通信 工业控制系统用现场总线 类型3:PROFIBUS规范 第4部分:数据链路层协议规范(中英文版) Digital data communication for measurement and control - Fieldbus for use in industrial systems Type 3: PROFIBUS specification - Part 4: Data link layer protocol specification |
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GB/T 20321.1-2006 离网型风能、太阳能发电系统用逆变器 第1部分:技术条件(中英文版) Inverter of wind and solar energy supply power system for off-grid - Part 1: Technical specification |
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GB/T 20206-2006 银行业印鉴核验系统技术规范(中英文版) Technical specification of banking seal verification system |
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GB/T 1231-2006 钢结构用高强度大六角头螺栓、大六角螺母、垫圈技术条件(中英文版) Specifications of high strength bolts with large hexagon head,large hexagon nuts,plain washers for steel structures |
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GB/T 20164-2006 传染病暴发流行期间疫区邮件及处理系统预防控制规范(中英文版) Prevention and control specifications for mail and mail handling systems in the area of when epidemics breakout |
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GB/T 20204-2006 水利水文自动化系统设备检验测试通用技术规范(中英文版) General testing specification of automatic system equipment for water resources and hydrology |
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GB/T 20030-2005 HFC网络设备管理系统规范(中英文版) Specification of Equipment Management System for HFC Network |
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GB 18240.5-2005 税控收款机 第5部分:税控打印机规范(中英文版) Fiscal cash register-Part 5:Specification of fiscal printer |
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GB/T 12229-2005 通用阀门 碳素钢铸件技术条件(中英文版) General Purpose industrial valves-Specification of carbon steel castings |
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GB/T 12230-2005 通用阀门 不锈钢铸件技术条件(中英文版) General purpose industrial valves-Specification of stainless steel castings |
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GB/T 12612-2005 多功能钢铁表面处理液通用技术条件(中英文版) General specification for multifunctional solution of iron and steel surface treatment |
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GB/T 19773-2005 变压吸附提纯氢系统技术要求(中英文版) Specification of hydrogen purification system on pressure swing adsorption |
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GB/T 19774-2005 水电解制氢系统技术要求(中英文版) Specification of water electrolyte system for producing hydrogen |
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GB/T 18240.4-2004 税控收款机 第4部分:银行卡受理设备规范(中英文版) Fiscal cash register--Part 4:Specification of device with EFT function |
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GB/T 19516-2004 高速公路有线紧急电话系统技术要求(中英文版) The specifications of wired-emergency telephone system of expressway |
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GB/T 12361-2003 钢质模锻件 通用技术条件(中英文版) General specification of steel die forgings |
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GB/T 16681-2003 信息技术 开放系统中文界面规范(中英文版) Information technology--Chinese interface specifications of open system |
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GB 18240.3-2003 税控收款机 第3部分: 税控器规范(中英文版) Fiscal cash register--Part 3: Specification of fiscal processor |
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GB 18240.1-2003 税控收款机 第1部分:机器规范(中英文版) Fiscal cash register--Part 1: Specification of device |
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GB/T 18838.1-2002 涂覆涂料前钢材表面处理 喷射清理用金属磨料的技术要求 导则和分类(中英文版) Preparation of steel substrates before application of paints and related products--Specifications for metallic blast-cleaning abrasives--General introduction and classification |
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GB/T 17850.1-2002 涂覆涂料前钢材表面处理 喷射清理用非金属磨料的技术要求 导则和分类(中英文版) Preparation of steel substrates before application of paints and related products--Specifications for non-metallic blast-cleaning abrasives--General introductionand classification |
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GB/T 4751-2002 户用沼气池质量检查验收规范(中英文版) Specification for check and acceptance of the quality for household anerobie digesters |
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GB/T 10394.2-2002 饲料收获机 第2部分:技术特征和性能(中英文版) Forage harvesters--Part 2:Specification of characteristics and performance |
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GB/T 6807-2001 钢铁工件涂装前磷化处理技术条件(中英文版) Specifications for phosphating treatment of iron and steel parts before painting |
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GB/T 4063-2001 蒸汽机车用煤技术条件(中英文版) Specifications of coals for steam locomotive |
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GB/T 17850.3-1999 涂覆涂料前钢材表面处理 喷射清理用非金属磨料的技术要求 铜精炼渣(中英文版) Preparation of steel substrates before application of paints and related products--Specifications for non-metallic blast-cleaning abrasives--Copper refinery slag |
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GB/T 9404-1999 微波接力通信馈线系统技术条件(中英文版) Technical specifications of feeder systems for microwave-relay communication |
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GB/T 16973.2-1997 信息技术 文本与办公系统 文件归档和检索(DFR) 第2部分:协议规范(中英文版) Information technology--Text and office systems--Document Filing and Retrieval(DFR)--Part 2:Protocol specification |
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GB/T 16891-1997 无绳电话系统设备总规范(中英文版) Generic specification for equipment of cordlesstelephone system |
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GB/T 16813-1997 无线电寻呼系统与公用电话自动交换网的接口技术要求及测试方法(中英文版) Technical specifications and test methods of the interface of radio paging system and PSTN |
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GB/T 15936.10-1996 信息处理 文本和办公系统 办公文件体系结构(ODA)和交换格式 第10部分:形式规范(中英文版) Information processing--Text and office systems--Office Document Architecture(ODA) and interchange format--Part 10:Formal specifications |
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GB/T 15189-1994 DOS中文信息处理系统接口规范(中英文版) Specification of DOS Chinese information processing system interface |
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GB/T 15121.1-1994 信息处理系统 计算机图形 存储和传送图片描述信息的元文卷 第一部分:功能描述(中英文版) Information processing systems--Computer graphics--Metafile for storage and transfer of picture description information--Part 1:Functional specification |
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GB/T 15061-1994 银盐感光材料感光测定通则 第1 部分:适用于白炽钨光和模拟日光曝光的试样曝光条件(中英文版) General specifications for sensitometry of silver halide photographic materials--Part 1:Sensitometric exposure conditions of films to be exposured for incandescent tungsten and daylight |
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GB/T 14236-1993 电视中心视频系统和脉冲系统设备技术要求(中英文版) Specifications of equipement for video and pulse system of TV centre |
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GB/T 12401-1990 国内卫星通信地球站天线(含馈源网络)和伺服系统设备技术要求(中英文版) Specificationof antenna (including feed network) and servo system used in domestic satellitecommunication earth stations |
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GB/T 5442-1985 电话自动交换网带内单频脉冲线路信号技术指标测试方法(中英文版) The test methods for the technical specifications of inband pulsing single frequency line signalling system for automatic telephone switching network |
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GB/T 3971.3-1983 电话自动交换网多频记发器信号技术指标测试方法(中英文版) The test methods for the technical specifications of multi-frequency register signalling for telephone auto-matic switching network |
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GB/T 3203-1982 渗碳轴承钢技术条件(中英文版) Specification for carburizing steels of bearings |
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