单项选择题
A.cold corrosion of the nozzles
B.fuel viscosity for better atomization
C.carbon accumulation on the nozzles
D.fuel detonation in the cylinders
单项选择题 The rate of fuel injection in a diesel engine cylinder depends primarily on （）.
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