单项选择题
A.they are more heavily built B.the fuel used is less volatile C.they can be easily reversed D.they operate at a lower speed
Before starting any diesel or gasoline engine，which of ...
单项选择题Before starting any diesel or gasoline engine，which of the following must be checked? （）
A.Oil level B.Flow of cooling water C.Exhaust discharge D.All of the above
All marine low-speed diesels are of what design?（）A.Fou...
单项选择题All marine low-speed diesels are of what design?（）
A.Four-stroke B.Two-stroke C.Electronic ignition D.Forced exhaust
All diesel engines are classified as（）.A.four cycleB.co...
单项选择题All diesel engines are classified as（）.
A.four cycle B.compression ignition C.vacuum ignition D.external combustion
