办公室工作机械化
mechanization of office work
包装机械工程
packaging mechanical engineering
包装机械工业
packaging machinery industry
北京机械工业学院
Beijing College of Mechanical Industry
铲运机工作监控面板
scraper operator monitor panel
铲运机工作监控面板塞插座
scraper operator monitor panel plug socket
成套木材加工机械
complete wood working machinery
乘算加速机械作用
multiplier-accelerator mechanism
抽油烟机工作模式
working modle of the range hood