单项选择题
A.natural gas B.diesel oil C.propane D.bunker fuel
Diesel engines obtain combustion air through turbo char...
单项选择题Diesel engines obtain combustion air through turbo chargers，blowers，or（）.
A.air starters B.carburetors C.natural aspiration D.air receivers
Diesel engines are considered safer than gasoline engin...
单项选择题Diesel engines are considered safer than gasoline engines because（）.
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
