阿摩線上測驗
30. Which type of bearing may be lubricated by seawater in a main propulsion shafting system?
(A) Thrust bearing
(B) Ball bearing
(C) Crosshead bearing
(D) Stern bearing
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統計： A(29), B(11), C(23), D(93), E(0) #577552
統計： A(29), B(11), C(23), D(93), E(0) #577552
