工业产品的质量主要是由设计、制造和管理等方面的因素决定的。毫无疑问,努力提高机械设计水平,避免一些错误,对于提高产品质量具有重要意义。在调查研究的基础上,笔者对机械设计中常见的一些错误作了分析,现举十二例说明如下: The quality of industrial products is largely determined by factors such as design, manufacturing and management. There is no doubt that efforts to improve the level of mechanical design, to avoid some errors, to improve product quality is of great significance. On the basis of the investigation and research, the author analyzes some common mistakes in the mechanical design. The following twelve examples are as follows: