單項(xiàng)選擇題For most ship engines，the fuel is（）.

A.natural gas
B.diesel oil
C.propane
D.bunker fuel


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1.單項(xiàng)選擇題Diesel engines obtain combustion air through turbo chargers，blowers，or（）.

A.air starters
B.carburetors
C.natural aspiration
D.air receivers

2.單項(xiàng)選擇題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

3.單項(xiàng)選擇題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

4.單項(xiàng)選擇題All marine low-speed diesels are of what design?（）

A.Four-stroke
B.Two-stroke
C.Electronic ignition
D.Forced exhaust

5.單項(xiàng)選擇題All diesel engines are classified as（）.

A.four cycle
B.compression ignition
C.vacuum ignition
D.external combustion