单项选择题
A.a cylinder air charge of higher pressure
B.increased pumping losses
C.less valve overlap
D.reduced blow-by
单项选择题 Late fuel injection occurring at, or after TDC in a diesel engine is indicated by excessive exhaust smoke and （）
单项选择题 In a unit injector the amount of fuel that will be forced through the spray nozzle on each stroke of the plunger depends on （）
单项选择题 If an auxiliary diesel engine temperature is higher than normal ,but the thermostat is determined not to be defective you would suspect a /an （）