基本解釋[經(jīng)濟(jì)學(xué)]旋片式機(jī)械泵詞組短語短語rotary y vane mechanical pump 旋片式機(jī)械泵rotary vane mechanical pump更多詞組專業(yè)釋義經(jīng)濟(jì)學(xué)旋片式機(jī)械泵