单项选择题
In a diesel engine, when installing new piston rings it is important to check（） Ⅰ.ring gap clearance Ⅱ.side clearance
A.Ⅰ only B.Ⅱ only C.both Ⅰ and Ⅱ D.neither Ⅰnor Ⅱ
单项选择题 At bottom dead center, the centerline of the connecting rod usually coincides with the（）
单项选择题 Which of the following problems represent one possible cause of high lube oil consumption in a four stroke diesel engine?（）
单项选择题 Late fuel oil injection in a diesel engine can result in （）
