文中通过发动机曲轴外径质量控制、发动机外壳缺陷质量控制进行了实例分析，该项目能提高产品的质量稳定性，降低产品缺陷率，且大大降低劳动强度。
The project can improve the quality of the product stability , low product defect rates , and greatly reduce the labor intensity .
产品缺陷率