Mechanical pencils for technical drawings—Part 3:Black leads—Bending strengths of HB leads
IDT ISO 9177-3:1994
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活动铅笔用硬度等级为HB的黑铅芯弯曲强度和试验方法。
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