单项选择题
A.low lube oil temperature B.high ambient air temperature C.low tube oil pressure D.high exhaust system back pressure
A.the type and size of the engine B.the condition of the engine C.ambient temperature D.all of the above
A.it has a longer power stroke B.more air gets into the cylinder each stroke C.it develops twice as many power strokes at the same speed D.higher combustion pressure is developed