单选题Heat damage to fuel injection nozzles can be prevented by avoiding （）Aexcessive fuel oil temperatureBlong periods of engine overloadCmetallic contact between nozzles and cylinder headsDhard carbon deposit and varnish on the nozzles
单选题
Heat damage to fuel injection nozzles can be prevented by avoiding （）
A
excessive fuel oil temperature
B
long periods of engine overload
C
metallic contact between nozzles and cylinder heads
D
hard carbon deposit and varnish on the nozzles
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