GB/T 50328-2014 第5.1.4条
| **** | Engineering documents shall use durable writing materials such as carbon ink or blue-black ink; fade-prone writing materials (e.g., ballpoint pens, pencils, red ink) shall not be used. |
| **** | Engineering documents shall use durable writing materials such as carbon ink or blue-black ink; fade-prone writing materials (e.g., ballpoint pens, pencils, red ink) shall not be used. |
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