問題詳情

17. Your vessel was vibrated heavily at a range of numbers of revolutions of the enginesbecause synchronization occurs between the periods of a vibration of the hull and those causedby the inertia of the reciprocating parts of engines. What do we call this speed?
(A)Regulative speed.
(B)Critical speed.
(C)Calibrating speed.
(D)Difficult speed.

參考答案

答案:B
難度:適中0.6
統計:A(8),B(24),C(2),D(5),E(0)

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