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五金专家
根据最新行业标准，系统地介绍了常用五金材料及产品。主要包括金属特性用途等基础资料、金属材料相关知识、五金工具等常用内容。计量单位换算、常用量具、常用刀具刃具、公差与配合在线计算、金属材料性能数据
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