GB/T 39023-2020/ISO 1 1540:2014.Writing and marking instruments-Specification for caps to reduce the...
GB国家标准
GB国家标准
GB国家标准
GB/T 39023-2020 书写和记号工具降低窒息风险的笔套规范
GB/T 39023-2020.Writing and marking instruments-Specification for caps to reduce the risk of asphyxi...