單項選擇題

For most ship engines，the fuel is（）.

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

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單項選擇題

Diesel engines obtain combustion air through turbo chargers，blowers，or（）.

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

單項選擇題

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