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（）.<br>A:caused by retarded injection timing<br>B:caused by a mechanical defect in one cylinder<br>C:caused by high fuel injection pressures<br>D:normal for these conditions

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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