Indirect cooling of fuel injector nozzle holders for diesel engines is accomplished primarily by （）.<br>A:heat conduction into the injected fuel oil<br>B:heat conduction into the water jacket wall<br>C:water circulation through passages in the holder<br>D:fuel oil circulation through passages in the holder

Indirect cooling of fuel injector nozzle holders for diesel engines is accomplished primarily by （）.
A:heat conduction into the injected fuel oil
B:heat conduction into the water jacket wall
C:water circulation through passages in the holder
D:fuel oil circulation through passages in the holder

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