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GB/T 39542.1-2020 Mechanical pencils for technical drawings—Part 1: Classification, dimensions, performance requirements and testing 技术制图活动铅笔 第1部分：分类、尺寸、性能要求和试验 - 中英文版 |
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GB/T 39542.2-2020 Mechanical pencils for technical drawings—Part 2: Black leads—Classification and dimensions 技术制图活动铅笔 第2部分：黑铅芯 分类和尺寸 - 中英文版 |
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GB/T 39542.3-2020 Mechanical pencils for technical drawings—Part 3: Black leads—Bending strengths of HB leads 技术制图活动铅笔 第3部分：黑铅芯 HB铅芯弯曲强度 - 中英文版 |
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GB/T 4460-2013 Mechanical drawings—Graphical symbols for kinematic diagrams 机械制图 机构运动简图用图形符号 - 中英文版 |
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