零件图的尺寸标注历来被视为《工程制图》课程重点教育内容之一。要使学生合乎要求地标注出零件图的尺寸,我们认为,结合学生学习中易出的错误实例教学,易于使学生掌握尺寸标注的正确性、完整性、清晰性、合理性。一、正确性方面的问题尺寸标注的正确性主要是指零件图上所注的尺寸必须严格遵守国家标准的有关规定。这方面的常见错误主要有:1 尺寸线、箭头、数字注写不 Part drawing dimensioning has always been regarded as one of the key educational contents of “Engineering Drawing” course. In order to enable students to mark out the size of the part drawings in accordance with the requirements, we believe that it is easy for students to grasp the correctness, completeness, clarity and rationality of the dimensioning in combination with the teaching of mistakes in the students’ learning. First, the correctness of the problem Dimensional accuracy is mainly refers to the size of the parts on the map must be strictly abide by the relevant provisions of national standards. Common mistakes in this area are: 1 size line, arrow, number Note write