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中国国家标准化管理委员会 GB/T 3078—×××× 目 次 前言···················································································Ⅰ 1 范围·················································································1 2 规范性引用文件 ·······································································1 3 分类·················································································2 4 订货内容·············································································3 5 尺寸、外形及允许偏差 ··································································3 6 技术要求·············································································3 6.1 牌号及化学成分