The interior of the tube must be kept a hard vacuum to preserve the photo cathode.
显象管内部一定要保证高真空才能保护光电阴极。
The sealing strips seal the suction zones towards the roll interior where no vacuum is created.
密封条用于密封朝向（非真空的）辊内部的抽吸区。
The sealing strips seal the suction zones towards the roll interior where no vacuum is created.
密封条用于密封朝向（非真空的）辊内部的抽吸区。
应用推荐