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

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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

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

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