单选题If the action of the engine indicates that some of the cylinders are not firing, the ones affected may be determined by watching （）.Athe bad smokeBthe smoky exhaustCthe exhaust temperatureDthe peak pressure
单选题
If the action of the engine indicates that some of the cylinders are not firing, the ones affected may be determined by watching （）.
A
the bad smoke
B
the smoky exhaust
C
the exhaust temperature
D
the peak pressure
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