Which of the terms listed below represents the operational speed at which excessive engine vibration is created?（）<br>A:Non-harmonic speed<br>B:Critical speed<br>C:Maximum speed<br>D:Design maximum speed

Which of the terms listed below represents the operational speed at which excessive engine vibration is created?（）
A:Non-harmonic speed
B:Critical speed
C:Maximum speed
D:Design maximum speed

出自：海船船员证

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