单项选择题
The longer the ignition delay period occurs in a diesel engine, the （）.
A.less fuel will enter the cylinder B.lower will be cylinder compression temperatures C.more complete will be fuel combustion D.more rapid will be the rise in combustion pressure
单项选择题 Poor combustion in a diesel engine can be caused by （）.
单项选择题 High firing pressures and a low exhaust temperature in a diesel engine may result from （）.
单项选择题 Whether using a centrifuge or a simple filter, oil cleaning and filtration will be the most effective when the oil is at a （）.
