PWS三辊行星轧机轧制
PSW three-roll planetary rolling mills
板栗剥苞机械化技术
The Technology of Chinese Chestnut Barker
办公室工作机械化
mechanization of office work
半机械化建筑法
semi-mechanized method of building
单机架可逆轧机机组
single stand reversing cold mill
电机机械式扫描
electromechanical scannig
scanning
electromechanical
发动机机械故障研究
Research on the mechanical failure of the engine