rotary type positive displacement compressors for petroleum, petrochemical and natural gas industries 石油石化和天然氣工業(yè)用旋轉(zhuǎn)式容積式壓縮機
petroleum and natural gas industries-rotary-type positive-displacement compressors-process compressors oil-free 石油和天然氣工業(yè).旋轉(zhuǎn)型容積式壓縮機.加工壓縮機
petroleum and natural gas industries-rotary-type positive-displacement compressors-packaged air compressors oil-free 石油和天然氣工業(yè).旋轉(zhuǎn)型容積式壓縮機.封裝的空氣壓縮機
petroleum and natural gas industries-rotary-type positive displacement compressors-part 1 : process compressors oil-free 石油和天然氣工業(yè).旋轉(zhuǎn)式正排量壓縮機.第1部分:加工壓縮機
the approximation to e-a type positive homogeneous operators by a-type positive homogeneous operators is preliminarily discussed 同時,探討了?正齊次算子對?正齊次算子的逼近問題。