In this paper, a new typepositive displacement compressor is advanced.
提出一种新结构形式的变容压缩器。
2
Petroleum and natural gas industries - Rotary-typepositive displacement compressors - Part 1: process compressors (oil-free).
石油和天然气工业。旋转型容积式压缩机。第1部分：加工压缩机（无油）
3
The utility model relates to a miniaturized positive ion electrostatic field formed by an electric traveling band type flexible negative electrode and an auxiliary thin wire typepositive electrode.