外部电源
external power supply system
external electrical source
outside source
exterior power supply
external power source
external power supply
三机设备选型
Model Selection of Three Machines
扫描电子束设备
Scanning microelectron beam system
沙地灌溉设备
irrigation facilities in sands
砂处理设备
sand preparation equipment
砂过滤设备基础
instrumental foundation of sand filtering