With one or more cylinders out of operation, the engine speed must be reduced because（）<br>A:in such cases, the air supply is no longer optimal, the thermal load will be higher<br>B:governor hunting will occur<br>C:torsional vibrations as other mechanical vibrations may occur<br>D:all of the above are correct

With one or more cylinders out of operation, the engine speed must be reduced because（）
A:in such cases, the air supply is no longer optimal, the thermal load will be higher
B:governor hunting will occur
C:torsional vibrations as other mechanical vibrations may occur
D:all of the above are correct

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