China tension GB Standards List

China "tension" GB Standards List:

Standard Code	Standard Title	Standard Class	Order
GB/T 23031.6-2023	Industrial Internet Platform Application Implementation Guide Part 6: Service-oriented Extension {译} 工业互联网平台应用实施指南第6部分：服务化延伸	China National Standards tension	English PDF
GB/Z 25320.1003-2023	Power system management and its information exchange Data and communication security Part 100-3: Conformance test cases for IEC 62351-3 and secure communication extensions including the TCP/IP protocol suite {译} 电力系统管理及其信息交换数据和通信安全第100-3部分：IEC 62351-3的一致性测试用例和包括TCP/IP协议集的安全通信扩展	China National Standards tension	English PDF
GB/T 13476-2023	Pre-tensioned prestressed concrete pipe piles {译} 先张法预应力混凝土管桩	China National Standards tension	English PDF
GB/T 42415-2023	Surfactants - Determination of static surface tension {译} 表面活性剂静态表面张力的测定	China National Standards tension	English PDF
GB/T 41346.2-2022	Safety of machinery-Transportation safety protection of machinery and equipment-Part 2: Safety requirements for tensioning devices {译} 机械安全机械装备转运安全防护第2部分：拉紧装置安全要求	China National Standards tension	English PDF
GB/T 13477.23-2022	Test methods for building sealing materials - Part 23: Determination of durability after tension-compression cycles under artificial accelerated weathering {译} 建筑密封材料试验方法第23部分：人工加速气候老化下拉伸-压缩循环后耐久性的测定	China National Standards tension	English PDF
GB/T 41933-2022	Plastics - Determination of tension-tension fatigue crack growth - Linear elastic fracture mechanics (LEFM) method {译} 塑料拉-拉疲劳裂纹扩展的测定线弹性断裂力学(LEFM)法	China National Standards tension	English PDF
GB/T 41596-2022	Load securing devices for road vehicles - General requirements for tensioning devices {译} 道路车辆装载物固定装置拉紧装置通用要求	China National Standards tension	English PDF
GB/T 40384-2021	Plastics—Determination of the transient extensional viscosity of polymer melts 塑料聚合物熔体瞬态拉伸黏度的测定	China National Standards tension	English PDF
GB/T 24202-2021	Carbon steel wire for tension members of optical fiber cable 光缆增强用碳素钢丝	China National Standards tension	English PDF
GB/T 39886-2021	Hyper-extension spinal orthoses 脊柱过伸矫形器	China National Standards tension	English PDF
GB/T 39797-2021	Test method for surface tension of glass melt -- Sessile drop method 玻璃熔体表面张力试验方法座滴法	China National Standards tension	English PDF
GB/T 40860-2021	Analysis requirements for design extension conditions of pressurized water reactor nuclear power plants 压水堆核电厂设计扩展工况分析要求	China National Standards tension	English PDF
GB/T 39187-2020	Jack up conductor/blow out preventer tension compensation system 自升式平台隔水管/防喷器张力补偿系统	China National Standards tension	English PDF
GB/T 39081-2020	Test method of cross tension test for resistance spot and embossed projection welds 电阻点焊及凸焊接头的十字拉伸试验方法	China National Standards tension	English PDF
GB/T 24522-2020	Metallic materials—Method of test for the determination of resistance to stable crack extension using specimens of low constraint 金属材料低拘束试样测定稳态裂纹扩展阻力的试验方法	China National Standards tension	English PDF
GB/T 38722-2020	Surface active agents—Determination of interfacial tension—Drawing up liquid films 表面活性剂界面张力的测定拉起液膜法	China National Standards tension	English PDF
GB/T 38658-2020	Guidance for the extension of validity of type tests of AC metal enclosed switchgear and controlgear for rated voltages above 3.6 kV and up to and including 40.5 kV 3.6 kV～40.5 kV交流金属封闭开关设备和控制设备型式试验有效性的延伸导则	China National Standards tension	English PDF
GB/T 7964-2020	Sintered metal materials(excluding hardmetal)--tension testing at room temperature 烧结金属材料(不包括硬质合金) 室温拉伸试验	China National Standards tension	English PDF
GB/T 39372-2020	Leather—Physical and mechanical tests—Determination of percentage extension 皮革物理和机械试验伸长率的测定	China National Standards tension	English PDF
GB/T 35465.6-2020	Test method for fatigue properties of polymer matrix composite materials—Part 6:Fatige properties of adhesives in shear by tension 聚合物基复合材料疲劳性能测试方法第6部分：胶粘剂拉伸剪切疲劳	China National Standards tension	English PDF
GB/T 35465.4-2020	Test method for fatigue properties of polymer matrix composite materials—Part 4: tension-compression fatigue and compression-compression fatigue 聚合物基复合材料疲劳性能测试方法第4部分：拉-压和压-压疲劳	China National Standards tension	English PDF
GB/T 38307-2019	Agricultural service—Guidelines for agricultural certified seed extension service 农业社会化服务农业良种推广服务通则	China National Standards tension	English PDF
GB/T 38307-2019	Agricultural service—Guidelines for agricultural certified seed extension service 农业社会化服务农业良种推广服务通则	China National Standards tension	English PDF
GB/T 37439-2019	Precast post-tensioned prestressed concrete simply-supported beam of high-speed railway 高速铁路预制后张法预应力混凝土简支梁	China National Standards tension	English PDF
GB/T 16825.2-2018	Verification of static uniaxial testing machines—Part 2: tension creep testing machines—Verification of the applied force 静力单轴试验机的检验第2部分：拉力蠕变试验机施加力的检验	China National Standards tension	English PDF
GB/T 1452-2018	Test method for flatwise tension strength of sandwich constructions 夹层结构平拉强度试验方法	China National Standards tension	English PDF
GB/T 34937-2017	Insulators for overhead lines—Composite suspension and tension insulators for d.c.systems with a nominal voltage greater than 1500 V—Definitions, test methods and acceptance criteria 架空线路绝缘子标称电压高于1500 V直流系统用悬垂和耐张复合绝缘子定义、试验方法及接收准则	China National Standards tension	English PDF
GB/T 34026-2017	General technical conditions for tensioning device of passenger ropeway 客运索道张紧装置通用技术条件	China National Standards tension	English PDF
GB/T 13477.11-2017	Test method for building sealants—Part 11：Determination of tensile properties at maintained extension after immersion in wates 建筑密封材料试验方法第11部分：浸水后定伸粘结性的测定	China National Standards tension	English PDF
GB/T 33837-2017	Coated glass fiber products—Determination of the tension-tension fatigue properties 玻璃纤维涂覆制品拉-拉疲劳性能的测定	China National Standards tension	English PDF
GB/T 13477.10-2017	Test method for building sealants—Part 10：Determination of tensile properties at maintained extension 建筑密封材料试验方法第10部分：定伸粘结性的测定	China National Standards tension	English PDF
GB/T 35465.3-2017	Test method for fatigue properties of polymer matrix composite materials -Part 3: tension-tension fatigue 聚合物基复合材料疲劳性能测试方法第3部分：拉-拉疲劳	China National Standards tension	English PDF
GB/T 33407-2016	Agricultural service—Construction guidelines of services organization in agricultural technology extension 农业社会化服务农业技术推广服务组织建设指南	China National Standards tension	English PDF
GB/T 33408-2016	Agricultural service—Organizational requirements of agricultural technology extension service 农业社会化服务农业技术推广服务组织要求	China National Standards tension	English PDF
GB/T 22638.4-2016	Test methods for aluminium and aluminium alloy foils—Part 4：Determination of surface wetting tension 铝箔试验方法第4部分：表面润湿张力的测定	China National Standards tension	English PDF
GB/T 33334-2016	Test method for strength properties of adhesives in shear by tension loading of single-lap-joint laminated assemblies(composite and composite) 胶粘剂单搭接拉伸剪切强度试验方法（复合材料对复合材料）	China National Standards tension	English PDF
GB/T 30170.2-2016	Geographic information—Spatial referencing by coordinates—Part 2: Extension for parametric values 地理信息基于坐标的空间参照第2部分：参数值扩展	China National Standards tension	English PDF
GB/T 19710.2-2016	Geographic information—Metadata—Part 2: Extensions for imagery and gridded data 地理信息元数据第2部分：影像和格网数据扩展	China National Standards tension	English PDF
GB/T 32398-2015	Chinese internet email address—Technical specification for SMTP extension to support 中文电子邮件地址简单邮件传输协议扩展技术要求	China National Standards tension	English PDF
GB 2099.7-2015	Plugs and socket-outlets for household and similar purposes—Part 2-7：Particular requirements for cord extension sets 家用和类似用途插头插座第2-7部分：延长线插座的特殊要求	China National Standards tension	English PDF
GB/T 7742.2-2015	Textiles—Bursting properties of fabrics—Part 2: Pneumatic method for determination of bursting strength and bursting distension 纺织品织物胀破性能第2部分：胀破强力和胀破扩张度的测定气压法	China National Standards tension	English PDF
GB/T 31468-2015	Petroleum and natural gas industries—Pipeline transportation systems—Recommended practice for pipeline life extension 石油天然气工业管道输送系统管道延寿推荐作法	China National Standards tension	English PDF
GB/T 31065-2014	Fire-resistant hose and hose assemblies for drilling platform tensioner 钻井平台张紧器用耐火软管及软管组合件	China National Standards tension	English PDF
GB/T 13936-2014	Rubber,vulcanized―Method for determination of strength properties of adhesive to metal in shear by tension loading 硫化橡胶与金属粘接拉伸剪切强度测定方法	China National Standards tension	English PDF
GB 31039-2014	Pretensioned spun concrete special-shaped piles 先张法预应力离心混凝土异型桩	China National Standards tension	English PDF
GB/T 30997-2014	Programming languages―C―Extensions to support embedded processors 编程语言 C 支持嵌入式处理器的扩展	China National Standards tension	English PDF
GB/T 30968.2-2014	Test method for open-hole/loaded-hole of polymer matrix composite laminates―Part 2: Test method of filled-hole tension and compression 聚合物基复合材料层合板开孔/受载孔性能试验方法第2部分：充填孔拉伸和压缩试验方法	China National Standards tension	English PDF
GB/T 19519-2014	Insulators for overhead lines―Composite suspension and tension insulators for a.c. systems with a nominal voltage greater than 1 000V―Definitions, test methods and acceptance criteria 架空线路绝缘子标称电压高于1 000 V交流系统用悬垂和耐张复合绝缘子定义、试验方法及接收准则	China National Standards tension	English PDF
GB/T 4989-2013	Extension and compensating cables for thermocouples 热电偶用补偿导线	China National Standards tension	English PDF
GB/T 3916-2013	Textiles - Yarns from packages - Determination of single-end breaking force and elongation at break using constant rate of extension (CRE) tester 纺织品卷装纱单根纱线断裂强力和断裂伸长率的测定（CRE法）	China National Standards tension	English PDF
GB 29280-2012	Information technology - Tibetan ideogram coded character set (extension set B) - 24×48 dot matrix font - Bkav bstan bold 信息技术藏文编码字符集(扩充集B) 24×48点阵字型甘丹黑体	China National Standards tension	English PDF
GB 29279-2012	Information technology - Tibetan ideogram coded character set (extension set B) - 24×48 dot matrix font - Bkav bstan lean 信息技术藏文编码字符集(扩充集B) 24×48点阵字型甘丹白体	China National Standards tension	English PDF
GB 29278-2012	Information technology - Tibetan ideogram coded character set (extension set B) - 16×32 dot matrix font - Bkav bstan bold 信息技术藏文编码字符集(扩充集B) 16×32点阵字型甘丹黑体	China National Standards tension	English PDF
GB 29277-2012	Information technology - Tibetan ideogram coded character set (extension set B) - 16×32 dot matrix font - Bkav bstan lean 信息技术藏文编码字符集(扩充集B) 16×32点阵字型甘丹白体	China National Standards tension	English PDF
GB 29276-2012	Information technology - Tibetan ideogram coded character set (basic set & extension set A) - 24×48 dot matrix font - Bkav bstan bold 信息技术藏文编码字符集(基本集及扩充集A) 24×48点阵字型甘丹黑体	China National Standards tension	English PDF
GB 29275-2012	Information technology - Tibetan ideogram coded character set (basic set & extension set A) - 24×48 dot matrix font - Bkav bstan lean 信息技术藏文编码字符集(基本集及扩充集A) 24×48点阵字型甘丹白体	China National Standards tension	English PDF
GB 29274-2012	Information technology - Tibetan ideogram coded character set (basic set & extension set A) - 16×32 dot matrix font - Bkav bstan bold 信息技术藏文编码字符集(基本集及扩充集A) 16×32点阵字型甘丹黑体	China National Standards tension	English PDF
GB 29273-2012	Information technology - Tibetan ideogram coded character set (basic set & extension set A) - 16×32 dot matrix font - Bkav bstan lean 信息技术藏文编码字符集(基本集及扩充集A) 16×32点阵字型甘丹白体	China National Standards tension	English PDF
GB/T 2039-2012	Metallic materials - Uniaxial creep testing method in tension 金属材料单轴拉伸蠕变试验方法	China National Standards tension	English PDF
GB/T 27842-2011	Chemicals - Test method for dynamic surface tension - Fast-bubble technique 化学品动态表面张力的测定快速气泡法	China National Standards tension	English PDF
GB/T 5549-2010	Surface active agents - Determination of surface tension by drawing up liquid films 表面活性剂用拉起液膜法测定表面张力	China National Standards tension	English PDF
GB/T 20719.43-2010	Industrial automation systems and integration - Process specification language - Part 43：Definitional extension：Activity ordering and duration extensions 工业自动化系统与集成过程规范语言第43部分：定义性扩展：活动次序和持续时间扩展	China National Standards tension	English PDF
GB/T 20719.41-2010	Industrial automation system and integration - Process specification language - Part 41：Definitional extension：Activity extensions 工业自动化系统与集成过程规范语言第41部分：定义性扩展：活动扩展	China National Standards tension	English PDF
GB 25913-2010	Information technology - Tibetan ideogram codedcharacter set (extension set B) 24×48 dot matrix font - Ucen Khyungyik 信息技术藏文编码字符集(扩充集B) 24×48点阵字型吾坚琼体	China National Standards tension	English PDF
GB/T 4990-2010	Alloy wires of extension and compensating cables for thermocouples 热电偶用补偿导线合金丝	China National Standards tension	English PDF
GB/T 757-2010	Conical shaft extension for rotating electrical machines 旋转电机圆锥形轴伸	China National Standards tension	English PDF
GB/T 756-2010	Cylindrical shaft extension for rotating electrical machines 旋转电机圆柱形轴伸	China National Standards tension	English PDF
GB/T 20719.44-2010	Industrial automation system and integration - Process specification language - Part 44: Definitional extension - Resource extensions 工业自动化系统与集成过程规范语言第44部分：定义性扩展资源扩展	China National Standards tension	English PDF
GB/T 24522-2009	Metallic materials - Method of test for the determination of resistance to stable crack extension using specimens of low constraint 金属材料低拘束试样测定稳定裂纹扩展阻力的试验方法	China National Standards tension	English PDF
GB/T 24202-2009	Carbon steel wire for optical fiber cable tension members 光缆增强用碳素钢丝	China National Standards tension	English PDF
GB 13476-2009	Pretensioned spun concrete piles 先张法预应力混凝土管桩	China National Standards tension	English PDF
GB/T 23427-2009	Shipbuilding and marine structures - Eye and fork assemblies under tension load - Main dimensions 造船与海上结构物受拉伸负荷的眼板和叉头组件主要尺寸	China National Standards tension	English PDF
GB/T 2088-2009	Cylindrical coiled tension spring dimensions and parameters 普通圆柱螺旋拉伸弹簧尺寸及参数	China National Standards tension	English PDF
GB/T 1239.1-2009	Cold coiled helical springs technical specifications - Part 1: Extension spring 冷卷圆柱螺旋弹簧技术条件第1部分：拉伸弹簧	China National Standards tension	English PDF
GB/T 22638.4-2008	Test methods for aluminium and aluminium alloy foils - Part 4: Determination of surface wetting tension 铝箔试验方法第4部分：表面润湿张力的测定	China National Standards tension	English PDF
GB/T 22543.1-2008	Instrument for dam monitoring - Exte nsion line gauge - Part 1: Step motor type extension line gauge 大坝监测仪器引张线仪第1部分：步进电机式引张线仪	China National Standards tension	English PDF
GB/T 22417-2008	Fork-lift trucks - Fork-arm extensions and telescopic fork arms - Technical characteristics and strength requirements 叉车货叉叉套和伸缩式货叉技术性能和强度要求	China National Standards tension	English PDF
GB/T 13807.3-2008	Connections with waisted stud - Nuts,extension sleeves 腰状杆螺柱连接副螺母、受力套管	China National Standards tension	English PDF
GB/T 14216-2008	Plastics - Film and sheeting - Determination of wetting tension 塑料膜和片润湿张力的测定	China National Standards tension	English PDF
GB 22323-2008	Information technology - Tibetan coded character set (basic set & extension set A) - 24×48 dot matrix font - Ucen khyungyik 信息技术藏文编码字符集(基本集及扩充集A) 24×48点阵字型吾坚琼体	China National Standards tension	English PDF
GB/T 16779-2008	Test method for tension-tension fatigue of fiber reinforced plastic laminates 纤维增强塑料层合板拉-拉疲劳性能试验方法	China National Standards tension	English PDF
GB/T 22139-2008	Specification for film tension in 35mm motion-picture systems 35mm电影系统影片张力规范	China National Standards tension	English PDF
GB/T 21547.4-2008	VMEbus extensions for intrumentation - Part 4: TCP/IP-IEEE488.2 instrument interface specification VME总线对仪器的扩展第4部分：TCP/IP-IEEE488.2仪器接口规范	China National Standards tension	English PDF
GB/T 16825.1-2008	Verification of static uniaxial testing machines - Part 1：tension/compression testing machines - Verification and calibration of the force-measuring system 静力单轴试验机的检验第1部分: 拉力和(或)压力试验机测力系统的检验与校准	China National Standards tension	English PDF
GB/T 22237-2008	Surface active agents - Determination of surface tension 表面活性剂表面张力的测定	China National Standards tension	English PDF
GB/T 22238-2008	Information technology - Tibetan coded character set - Extension B 信息技术藏文编码字符集扩充集B	China National Standards tension	English PDF
GB/T 1688-2008	Rubber,vulcanized - Determination of tension fatigue 硫化橡胶伸张疲劳的测定	China National Standards tension	English PDF
GB/T 18396-2008	Natural latex - Determination of surface tension by the ring method 天然胶乳环法测定表面张力	China National Standards tension	English PDF
GB/T 7732-2008	Metallic materials - Fracture toughness testing method with surface crack tension specimens 金属材料表面裂纹拉伸试样断裂韧度试验方法	China National Standards tension	English PDF
GB/T 21547.3-2008	VMEbus Extensions for instrumentation - Part 3: TCP/IP-IEEE488.1 Interface specification VME总线对仪器的扩展第3部分：TCP/IP-IEEE488.1 接口规范	China National Standards tension	English PDF
GB/T 21547.2-2008	VMEbus Extensions for instrumentation -Part 2: TCP/IP-VXIbus Interface specification VME总线对仪器的扩展第2部分：TCP/IP-VXI总线接口规范	China National Standards tension	English PDF
GB/T 21547.1-2008	VME bus Extensions for instrumentation - Part 1: TCP/IP Instrument protocol specification VME总线对仪器的扩展第1部分: TCP/IP仪器协议规范	China National Standards tension	English PDF
GB/T 6482-2007	Thread extension steel bars for rock drilling 凿岩用螺纹连接钎杆	China National Standards tension	English PDF
GB/T 21077.2-2007	Banking - Certificate management - Part 2: Certificate extensions 银行业务证书管理第2部分: 证书扩展项	China National Standards tension	English PDF
GB/T 17564.5-2007	Standard data element types with associated classification scheme for electric components - Part 5: Extensions to the EXPRESS dictionary schema 电气元器件的标准数据元素类型和相关分类模式第5部分: EXPRESS 字典模式扩展	China National Standards tension	English PDF
GB/T 20671.7-2006	Classification system and test methods for nonmetallic gasket materials - Part 7: Standard test methods for tension testing of nonmetallic gasket materials 非金属垫片材料分类体系及试验方法第7部分: 非金属垫片材料拉伸强度试验方法	China National Standards tension	English PDF
GB/T 20542-2006	Infromation technology - Tibetan coded character set - Extension A 信息技术藏文编码字符集扩充集A	China National Standards tension	English PDF
GB/T 12167-2006	Aluminium alloy grip clamps of tension wire for live working 带电作业用铝合金紧线卡线器	China National Standards tension	English PDF
GB/T 7742.1-2005	Textiles-Bursting properties of fabrics-Part1:Hydraulic method for determination of bursting strength and bursting distension 纺织品织物胀破性能第1部分:胀破强力和胀破扩张度的测定液压法	China National Standards tension	English PDF
GB/T 16825.2-2005	Verification of static uniaxial testing machines-Part 2:tension creep testing machines-Verification of the applied force 静力单轴试验机的检验第2部分：拉力蠕变试验机施加力的检验	China National Standards tension	English PDF
GB/T 1973.2-2005	Small cylindrically coiled tension spring—Dimensions and parameters 小型圆柱螺旋拉伸弹簧尺寸及参数	China National Standards tension	English PDF
GB/T 1452-2005	Test method for flatwise tension strength of sandwich constructions 夹层结构平拉强度试验方法	China National Standards tension	English PDF
GB/Z 19717-2005	Secure message interchange based on Multipurpose Internet Mail Extensions 基于多用途互联网邮件扩展（MIME）的安全报文交换	China National Standards tension	English PDF
GB/T 6965-2004	Testing basic terms of materials for fishing gear--Pretension 渔具材料试验基本条件预加张力	China National Standards tension	English PDF
GB/T 18946-2003	Rubber-coated fabrics--Determination of rubber-to-fabric adhesion--Direct tension method 橡胶涂覆织物橡胶与织物粘合强度的测定直接拉力法	China National Standards tension	English PDF
GB/T 13477.10-2002	Test method for building sealants--Part 10:Determination of tensile properties at maintained extension 建筑密封材料试验方法第10部分:定伸粘结性的测定	China National Standards tension	English PDF
GB/T 13477.11-2002	Test method for building sealants--Part 11:Determination of adhesion/cohesion properties at maintained extension after immersion in water 建筑密封材料试验方法第11部分:浸水后定伸粘结性的测定	China National Standards tension	English PDF
GB/T 15970.4-2000	Corrosion of metals and alloys--Stress corrosion testing--Part 4:Preparation and use of uniaxially loaded tension specimens 金属和合金的腐蚀应力腐蚀试验第4部分:单轴加载拉伸试样的制备和应用	China National Standards tension	English PDF
GB/T 17975.9-2000	Information technology--Generic coding of moving pictures and associated audio information--Part 9:Extension for real time interface for systems decoders 信息技术运动图像及其伴音信息的通用编码第9部分:系统解码器的实时接口扩展	China National Standards tension	English PDF
GB/T 2311-2000	Information technology--Character code structure and extension techniques 信息技术字符代码结构与扩充技术	China National Standards tension	English PDF
GB/T 2414.2-1998	Test methods for the properties of piezoelectric ceramics--Transverse length extension vibration mode for bar 压电陶瓷材料性能试验方法长条横向长度伸缩振动模式	China National Standards tension	English PDF
GB/T 2414.1-1998	Test methods for the properties of piezoelectric ceramics--Radial extension vibration mode for disk 压电陶瓷材料性能试验方法圆片径向伸缩振动模式	China National Standards tension	English PDF
GB/T 13142-1991	Extension of the Latin alphabet coded character set for bibliographic information interchange 书目信息交换用拉丁字母代码字符扩充集	China National Standards tension	English PDF
GB/T 11985-1989	Surface active agents--Determination of interfacial tension--Drop volume method 表面活性剂界面张力的测定滴体积法	China National Standards tension	English PDF
GB/T 7750-1987	Test method of creep properties of adhesive in shear by tension loading (metal to metal) 胶粘剂拉伸剪切蠕变性能试验方法 (金属对金属)	China National Standards tension	English PDF
GB/T 7419-1987	Information processing--Implementation of the 7-bit coded character set and its 7-bit and 8-bit extensions on 3.81mm magnetic tape cassette for data interchange 信息处理数据交换用七位编码字符集及其七位与八位扩充在3.81mm盒式磁带上的实现方法	China National Standards tension	English PDF
GB/T 7964-1987	Sintered metal materials (excluding hardmetal)--tension testing at room temperature 烧结金属材料(不包括硬质合金) 室温拉伸试验	China National Standards tension	English PDF
GB/T 6541-1986	Petroleum products--Mineral oils--Determination of interfacial tension of oil against water--Ring method 石油产品油对水界面张力测定法 (圆环法)	China National Standards tension	English PDF

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