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單項(xiàng)選擇題

Heat damage to fuel injection nozzles on small high-speed diesel engines, can be prevented by（）

A.employing fuel oil as a cooling medium
B.preventing hard carbon deposit on nozzle tips
C.avoiding fuel oil temperature exceeding builder’s specification
D.ensuring good metallic contact between nozzles and cylinder heads

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單項(xiàng)選擇題

One of the advantages in the use of a dry liner over a wet liner is（）

A.it is fitted with neoprene O-ring seals
B.the honing process makes it easier to maintain the desired oil film
C.there is likelihood of water leaking into the combustion space
D.it fits more loosely due to a decrease in heat transfer through the composite wall

單項(xiàng)選擇題

One characteristic of a pulse type turbo-charging system is（）

A.high average exhaust manifold
B.greatly fluctuating inlet manifold pressure
C.constant exhaust manifold pressure
D.multiple exhaust pipes to the turbocharger