In this paper, the calculating formula and marking method of positioning tolerance are presented in detail.
本文比较详细地介绍了位置度公差值的计算公式及如何标注。
Artificial marking method adopts centralized water way, lacking of effective supervision mechanisms and can't guarantee the marking quality.
人工阅卷采用集中式流水阅卷方式，缺乏有效的监督机制，无法保证阅卷质量。
Nowadays, laser marking technology has become a effective marking method for many substances such as plastic, quartz, ceramic, metal and so on.
激光打标机已成为塑料、石英、陶瓷、金属等多种材料的打标工具。
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