問題詳情
15. Which possible reason will not make centrifugal pumps to vibrate?
(A) Bent shaft
(B) The impeller has become partially clogged so that the balance is disturbed
(C) Worn bearing
(D) Complete impeller
參考答案
答案：D
難度：適中0.461538
統計：A(2),B(16),C(6),D(24),E(0)