Mechanical pencils for technical drawings—Part 1:Classification,dimensions,performance requirements and testing
IDT ISO 9177-1:2016
全国制笔标准化技术委员会(SAC/TC 378)
GB/T 39011的本部分规定了技术制图用活动铅笔的分类、尺寸、性能要求和试验方法。
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