When the normal compression ratio of a diesel engine is not very high, misfiring at light loads may be caused by （）<br>A:overloading the engine<br>B:low exhaust valve lift<br>C:excessive cylinder cooling<br>D:insufficient mechanical clearance

When the normal compression ratio of a diesel engine is not very high, misfiring at light loads may be caused by （）
A:overloading the engine
B:low exhaust valve lift
C:excessive cylinder cooling
D:insufficient mechanical clearance

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