单项选择题
Which of the conditions listed would cause simultaneous high cylinder firing pressure and low exhaust temperature?（）
A.Improper fuel rack positioning B.Lengthy opening of the exhaust valve C.Excessively early injection timing D.Extended light load operation
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（）
单项选择题 Which of the terms listed below represents the operational speed at which excessive engine vibration is created?（）
