单项选择题
A.High sulphur content fuel
B.High lube oil temperatures
C.High vanadium content fuel
D.Excessive piston slap
单项选择题 Reducing the clearance between a valve stem and rocker arm will result in the valve （）
单项选择题 If you increase the clearance between a valve stem and rocker arm, which of the listed condition will occur?（）
单项选择题 A drop in compression pressure in one cylinder of a diesel engine can be caused by（）