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单选题
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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更多 “单选题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 timingB caused by a mechanical defect in one cylinderC caused by high fuel injection pressuresD normal for these conditions” 相关考题
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low exhaust temperatureB
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