容积式鼓风机

resultant displacement

positive displacement self-priming progressive cavity rotary pump

Wien displacement law

phase deviation【电子】;phase displacement【电子】;phase shift【电子】

infinitesimal displacement【数】

preventing in non-positive displacement machines or engines, form of blades

displacement【化学】;metathesis【化学】;permutation【数】

non-positive-displacement pump for pumping liquids and liquids at the same time