問題詳情

27. Which type of pump is positive displacement? And the pump is self-priming and capableof producing a high vacuum.
(A) Gear pump
(B) Injector pump
(C) Volute pump
(D) Centrifugal pump

參考答案

答案：A
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)