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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

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單項選擇題

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

單項選擇題

All marine low-speed diesels are of what design?（）

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

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