金属阀门 结构长度
Metal valves-Face to face,end to end,center toface and center to end dimensions
检测标准
熔模铸造用硅砂、粉
Silica sand and flour for investment casting
技术制图焊缝符号的尺寸、比例及简化表示法
Technical drawings Dimensions,proportions and simplified representation for welding symbols
耐热钢棒
Heat-resistant steel bars
熔模铸造用铝矾土砂、粉
Bauxite sand and flour for investment casting
人工煤气组分与杂质含量测定方法
Test methods of components and impurities of the manufactured gas
信息处理 磁墨字符识别 第1部分:E13B的印制规范
Information processing-Magnetic ink character recognition Part 1:Print specifications for E13B
圆头方颈螺栓
Cup head square neck bolts
汉语信息处理词汇 02部分:汉语和汉字
Chinese information processing-Vocabulary Part 02:Chinese and Chinese character
城镇燃气热值和相对密度测定方法
Testing method to determine the calorific values of town gas
