单项选择题
A.low TBN value B.high alkaline reserve C.low flash point D.high pour point
In a four-stroke/cycle diesel engine, after the complet...
单项选择题In a four-stroke/cycle diesel engine, after the completion of the power stroke, the piston will move（）
A.up and draw in a fresh air charge B.down to burn off fuel C.down to compress the fuel air charge D.up and force out the exhaust gases
A fuel injection valve opening at pressure lower than n...
单项选择题A fuel injection valve opening at pressure lower than normal will result in（）.
A.late fuel injection B.early fuel injection C.high exhaust temperature from that cylinder D.decreased effective stroke from that injector
In a diesel engine, exhaust valves open before the inta...
In a diesel engine, exhaust valves open before the intake ports are uncovered to （） Ⅰ.reduce pumping losses Ⅱ.reduce back pressure
A.Ⅰonly B.Ⅱonly C.bothⅠand Ⅱ D.neitherⅠnor Ⅱ
