1991 year China issued GB standards list


	GB/T 13298-1991 Metal--Inspection method of microstructure 金属显微组织检验方法
	GB/T 223.12-1991 Methodsfor chemical analysis of iron，steel and alloy--The sodium carbonate separation-diphenyl carbazide photometric method for the determination of chromium content 钢铁及合金化学分析方法碳酸钠分离-二苯碳酰二肼光度法测定铬量
	GB/T 13065-1991 Blank detail specification of gas discharge tubes for overvoltage protection 过电压保护气体放电管空白详细规范 (可供认证用)
	GB/T 13212-1991 Canned water chestnuts 清水荸荠罐头
	GB/T 13137-1991 Specification for 12-channel telephone carrier terminal equipment used on the symmetric pains of 2.6/9.5 mm coaxial cable 2.6/9.5 mm综合中同轴电缆高频四芯组或高频线对12路载波电话终端设备技术条件
	GB/T 13270-1991 Atmospheric air--Test dust standardsample--Simulated atmospheric dust 大气试验粉尘标准样品模拟大气尘
	GB/T 12968-1991 Eddy current decay method formeasurement of resistivity and residual resistance ratio of pure metals 纯金属电阻率与剩余电阻比涡流衰减测量方法
	GB/T 12934-1991 Marine oil-free air compressor for control use--Technical specifications 船舶控制设备用无油空气压缩机技术条件
	GB/T 13220-1991 Determination of particle size distribution of fine powder--Method of sieve classfication with sonic wave 细粉末粒度分布的测定声波筛分法
	GB/T 12765-1991 Spherical plain bearings，joint type--Abutment andfillet dimensions 关节轴承安装尺寸
	GB/T 3304-1991 Names of nationalities of China in romanization with codes 中国各民族名称的罗马字母拼写法和代码
	GB/T 13130-1991 Specification for interworking of chinese ideogram teletex on public telecommunication networks--Transport service 汉字智能用户电报在公用电信网上的互通技术条件运输服务
	GB/T 13238-1991 Copper-steel clad plates 铜钢复合钢板
	GB/T 12910-1991 Paper and board--Determination of titanium dioxide 纸和纸板二氧化钛含量的测定法
	GB/T 12858-1991 Environment requirements and testmethods for ground radio-navigation equipments 地面无线电导航设备环境要求和试验方法
	GB/T 13021-1991 Determination for the carbon black content of polyethylene pipes and fittings by calcination and pyrolysis 聚乙烯管材和管件炭黑含量的测定热失重法
	GB 13134-1991 Yi coded character set for information interchange 信息交换用彝文编码字符集
	GB/T 12775-1991 Generic specification for disc-style ceramic dielectric variable preset capacitors in electronic equipment 电子设备用圆片型瓷介预调可变电容器总规范
	GB/T 12760-1991 Cylindrical worm and wormwheel information of the dimensional data to be given on the drawing 圆柱蜗杆、蜗轮图样上应注明的尺寸数据
	GB/T 13266-1991 Water quality--Determination of the acute toxicity of substance to Daphnia (Daphnia magna straus) 水质物质对蚤类(大型蚤)急性毒性测定方法

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