单选题Operating a diesel engine under light loads and at low temperatures for an exhaust for an extended period can result in（）Aformation of carbon on the intake and exhaust portsBhigh water jacket temperaturesCoverheated pistons and cylindersDan increase in lube oil viscosity due to fuel dilution
单选题
Operating a diesel engine under light loads and at low temperatures for an exhaust for an extended period can result in（）
A
formation of carbon on the intake and exhaust ports
B
high water jacket temperatures
C
overheated pistons and cylinders
D
an increase in lube oil viscosity due to fuel dilution
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