单项选择题
Combustion knock can occur in the cylinders of a diesel engine under any condition permitting （）.
A.a shortened ignition delay period B.a lean fuel/air mixture C.excess fuel in the combustion chamber D.rapid vaporization of injected fuel droplets
单项选择题 Diesel engine control can be obtained by the bridge （）.
单项选择题 To determine if the lube oil filter elements need changing, （）.
单项选择题 Which of the two events listed occurs simultaneously in a two-stroke/cycle diesel engine?（）
