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單項(xiàng)選擇題

Diesel oil may be used to cool （） of a diesel engine.

A.cylinders
B.exhaust valves
C.pistons
D.fuel valves

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單項(xiàng)選擇題

Diesel engines are started by supplying （） into the cylinders in the appropriate sequence for the required direction.

A.fuel oil
B.diesel oil
C.compressed air
D.jacket water

單項(xiàng)選擇題

Diesel engines are started by supplying （） into the cylinders in the appropriate sequence for the required direction.

A.cooling water
B.compressing air
C.compressed air
D.cylinder oil

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