阿摩線上測驗
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
答案：登入後查看
統計： A(28), B(64), C(33), D(163), E(0) #1111783
統計： A(28), B(64), C(33), D(163), E(0) #1111783
