双级 meaning in English

twin-stage

La high - efficiency double - stage vacuum oil purifier
系列高效双级真空滤油机
Compound two stage propane screw compressor unit
单机双级丙烷螺杆压缩机组
Double - polarity method for calibrating thermocouple
热电偶双级检定法
Variable moving blade double stage axial fan
动叶可调双级轴流式风机
Reciprocating single - machine double - stage refrigerating compressor
活塞式单机双级制冷压缩机

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