38.For a ship with direct-connected low-speed propulsive engine, which is usually the dominant source of
torque variation for the shafting system?
(A)Engine power variation
(B)Axial displacement of thrust bearing
(C)Torsional vibration of propulsive shaft
(D)Longitudinal vibration of engine
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對於具有直接連接的低速推進發動機的船舶，...
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