Through the technological analysis of the trimming of the CA488 engine oil disc, the structure of the trimming die with a vertical boss component was determined. The inserting pattern for the punch and the matrix was introduced.是什么意思_Through the technological analysis of the trimming of the CA488 engine oil disc, the structure of the trimming die with a vertical boss component was determined. The inserting pattern for the punch and the matrix was introduced.在线翻译_英语_读音_用法_例句