单项选择题
A.amount of scavenge air to the cylinder
B.quality of fuel injected
C.viscosity of the lube oil
D.compression ratio of the piston
单项选择题 Which of the following reasons represents why the designed compression ratio of a gasoline engine is lower than that of a diesel engine?（）
单项选择题 The exhaust system of a diesel engine is usually designed to remove exhaust gases and to （）
单项选择题 Which of the conditions listed could cause the cylinder relief valves on a large, low-speed, propulsion diesel engine to lift?（）