单项选择题
The purpose of compressing the air within the cylinder of a diesel engine is to （）
A.produce the heat for ignition B.decrease injection lag C.increase ignition delay D.aid in exhausting burnt gases
单项选择题 A smoking exhaust from an operating diesel engine could be caused by （）
单项选择题 What is commonly used to create turbulence in a diesel engine combustion system?（）
单项选择题 What causes diesel fuel to be ignited in the cylinder of an operating diesel engine?（）
