单项选择题
Diesel engine exhaust gas temperatures can be used to determine individual cylinder （）.
A.performance B.horsepower output C.fuel consumption D.scavenge effect
单项选择题 Improper cooling of a diesel engine cylinder liner due to the accumulation of scale deposits may cause （）.
单项选择题 In describing engine operation, what does the term “cycle” mean?（）
单项选择题 An advantage of aluminum pistons, when compared to cast iron pistons is （）.
