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Before shutting off the fuel supply to stop a medium or high–speed diesel engine, why is it necessary to allow the engine to idle for a few minutes?（）
A:To prevent internal damage form local overheating
B:To ensure the fuel nozzles are flushed clean
C:To clear the smoke stack
D:To let the waste heat boiler reduce its rate of steam generation

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出自：海船船员证

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