In order to minimize oil vapor migration, some lyophilizers are designed with a tortuous path between the vacuum pump and chamber.
为了最小化油蒸汽的回流，一些冻干机在真空泵和前箱间设计了弯曲的管路。
2
In this paper, the maintenance of vacuum system of ICP, Repair of light cabinet, correction of light path, upgrade of computer and operation system of ms-dos were described in detail.
The molecular distillation (short-path distillation or unobstructed distillation) is a special separation technique of liquid-liquid and a special distillation technique under the high vacuum.