Heat damage to fuel injection nozzles can be prevented by avoiding （）<br>A:excessive fuel oil temperature<br>B:long periods of engine overload<br>C:metallic contact between nozzles and cylinder heads<br>D:hard carbon deposit and varnish on the nozzles

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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