正确答案: D

水分和酸

题目：曲轴轴颈表面的腐蚀凹坑、锈斑，主要是滑油中含有（）。

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学习资料的答案和解析：

[单选题]为了最大限度利用排气废热，在标定工况下废气锅炉排气出口温度为t2=露点+△t，式中△t不应小于（）。

25℃

[单选题]已知Sulzer6S20型船用柴油机气缸套最大内径为202mm，则气缸最大内径增量为（）。

2mm

[单选题]油润滑艉轴密封装置的防蚀衬套选用（）制造。

镀铬钢套或不锈钢

[单选题]（） is sometimes used for piston cooling since leaks into the crankcase would not cause problems.

Lube oil

[单选题]Rotating flyweights acting against spring pressure make a simple type of （）.

governor

[单选题]The lubricating pipes and dusts should be blown out with （）.

compressed air

[单选题]Which of the following would cause a diesel to have black smoke?（）

leaky injector

[单选题]Indirect cooling of fuel injector nozzle holders for diesel engines is accomplished primarily by （）.

heat conduction into the water jacket wall