单选题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?（）ATo prevent internal damage form local overheatingBTo ensure the fuel nozzles are flushed cleanCTo clear the smoke stackDTo let the waste heat boiler reduce its rate of steam generation
单选题
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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