问题

Operating a diesel engine under light loads and at low temperatures for an exhaust for an

Operating a diesel engine under light loads and at low temperatures for an exhaust for an extended period can result in________.

A.formation of carbon on the intake and exhaust ports

B.high water jacket temperatures

C.overheated pistons and cylinders

D.an increase in lube oil viscosity due to fuel dilution

请帮忙给出正确答案和分析，谢谢！

参考答案

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