In the process of the stand-by, warm-up the engine usually through give preheat of which parts of the diesel engine?（）<br>A:cooling water of the cooling system<br>B:fuel of the FO system<br>C:LO of the LO system<br>D:cooling water of the cooling system and LO of the LO system

In the process of the stand-by, warm-up the engine usually through give preheat of which parts of the diesel engine?（）
A:cooling water of the cooling system
B:fuel of the FO system
C:LO of the LO system
D:cooling water of the cooling system and LO of the LO system

出自：海船船员证

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