This article presents the structure of ball pen cores and its principle of operation. Some Suggestions are given to improve its qualities.
本文介绍了圆珠笔芯的构造及其工作原理，提出了提高圆珠笔芯质量的某些途径。
This article presents the structure of ball pen cores and its principle of operation. Some Suggestions are given to improve its qualities.
本文介绍了圆珠笔芯的构造及其工作原理，提出了提高圆珠笔芯质量的某些途径。
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