Dimensions mark is an important part of drawing spares mapping, and dimensions of spares mapping is the ruler of machining and checking spares.
尺寸标注是绘制零件工作图的一项重要内容，零件图中的尺寸是加工和检验零件的重要依据。
In the machining process, often need a bench worker use scriber mark lines on the work piece to determine the processing location and inspection.
在机械加工过程中，经常需要对工件进行钳工划线，以确定加工位置、进行钳工检查。
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