单项选择题
A.the size of the holes in the fuel nozzle
B.timing of the pump
C.supply pressure to the pump
D.shape of the combustion chamber
单项选择题 The camshaft on a four-stroke/cycle diesel engine provides a means to operate the （）.
单项选择题 A two-stroke diesel engine exhaust temperature will be lower than a four-stroke diesel engine of the same displacement because the （） (1) scavenging air is cooling the exhaust gases (2) exhaust cycle time is longer
单项选择题 If the chemical analysis of a lube oil sample taken from a diesel engine indicates an increased neutralization number, the （）.