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Engine_2014 : Motor Plants and Auxiliary Boilers - 1076/2614
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The knock occurring when a cold diesel engine is started and continues while running at low speed, but stops when the engine reaches normal operating speed and temperature, is __________ .
A) caused by retarded injection timing
B) caused by a mechanical defect in one cylinder
C) caused by high fuel injection pressures
D) normal for these conditions
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