单项选择题
In describing engine operation, what does the term “cycle” mean?（）
A.The sequence of events that produce a power pulse B.One rotation of the engine crankshaft C.One stroke of a piston D.All of the above
单项选择题 An advantage of aluminum pistons, when compared to cast iron pistons is （）.
单项选择题 Which of the combustion parameters listed is used in a diesel engine, but NOT related to the injection system?（）
单项选择题 Successful combustion inside the cylinders of a diesel engine is dependent upon （）.
