单项选择题
A.late fuel injection
B.early fuel injection
C.high exhaust temperature from that cylinder
D.decreased effective stroke from that injector
单项选择题 In a diesel engine, exhaust valves open before the intake ports are uncovered to （） Ⅰ.reduce pumping losses Ⅱ.reduce back pressure
单项选择题 Which of the engine components listed increases air charge density and helps to improve engine operating efficiency?（）
单项选择题 A diesel engine will lose power if fuel injection occurs too early because the （）