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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

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