mainadj.主要的；最重要的n.干线；总管道；[pl](水、煤、电)供应系统；<古>大海Mainhardtn.美因哈特(在德国；东经 9º33' 北纬 49º05')

1. The key points in designing the mechanism of automatic revolving de-threading are stated in detail.
   重点阐述自动旋转脱螺纹机构的设计要点。
2. Keys to technology and die design of stamp-ing of Al alloy profile have been introduced.
   介绍了铝合金型材在冲压加工时的工艺特点和模具设计要点。