問題詳情
36. Which is not feature of rotary pumps?
(A) Wear decreases the clearances with consequent loss of efficiency, especially whenhanding low viscosity fluids.
(B) They are self-priming.
(C) They are capable of producing high vacuum.
(D) They give a steady flow, but are less efficient than reciprocator becausedifferential pressure between suction and discharge.
參考答案
答案：A
難度：適中0.408805
統計：A(65),B(36),C(35),D(23),E(0)