RH真空吹氮
RH Vacuum Blowing Nitrogen
电子纺纱真空调节
electronic spinning vacuum adjutment
动态真空系统
dynamic vacuum system
Demountable vacuum system
低真空变压
Low vacuum varying pressure
Low vacuum transformable pressure
coarse vacuum pressure alterable
多室真空系统
multi-chamber vacuum system
抽真空防腐
vacuum extraction for corrosion prevention