Critical speed in diesel engines occurs when engine torque pulsations become （）<br>A:opposed to the crankshaft rocking couple<br>B:resonant with the crankshaft natural frequency<br>C:critical fore and aft crankshaft vibrations<br>D:horizontal whipping motions of the crankshaft

Critical speed in diesel engines occurs when engine torque pulsations become （）
A:opposed to the crankshaft rocking couple
B:resonant with the crankshaft natural frequency
C:critical fore and aft crankshaft vibrations
D:horizontal whipping motions of the crankshaft

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