Heat damage to fuel injection nozzles on small high-speed diesel engines, can be prevented by（）<br>A:employing fuel oil as a cooling medium<br>B:preventing hard carbon deposit on nozzle tips<br>C:avoiding fuel oil temperature exceeding builder’s specification<br>D:ensuring good metallic contact between nozzles and cylinder heads

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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