To overcome these problems the oilfreevacuum system has been developed.
为了克服这些问题，开发了无油真空系统。
2
The paper also introduces the composing and characteristics of oilfreevacuum environmental simulator, the parameters' analysis of leak detection, and so on.
同时，还介绍了完成该项试验的无油真空环境模拟设备的组成、特点及检漏系统的参数分析等。
3
Accumulated debris shall be removed by vacuum, blowing with oil-free air, or wiping with clean rags.