耗时五年 中国终于研究出2.3毫米圆珠笔头!
Chinas first batch of steel wires for making 2.3-mm ballpoint pen tips recently rolled off the production line of Taiyuan
2023-11-25 01:42:01 98Chinas first batch of steel wires for making 2.3-mm ballpoint pen tips recently rolled off the production line of Taiyuan
2023-11-25 01:42:01 98