单项选择题
One of function of diesel engine lubricating oil is to （）
A.induce carbon formation on cylinder walls B.improve fuel penetration in the combustion space C.form a friction reducing film between mating surfaces D.lubricate the fuel injection
单项选择题 Which of the conditions listed would cause simultaneous high cylinder firing pressure and low exhaust temperature?（）
单项选择题 After-cooling of a turbocharged diesel engine will result in （）
单项选择题 Lubricating oil used in a diesel engine serves to（）
