曲轴轴颈表面的腐蚀凹坑、锈斑，主要是滑油中含有（）。

【名词&注释】

不锈钢(stainless steel)、船用柴油机(marine diesel engine)、柴油机气缸套(engine cylinder liner)

[单选题]曲轴轴颈表面的腐蚀凹坑、锈斑，主要是滑油中含有（）。

A. 水分
B. 酸
C. 碱
D. 水分和酸

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学习资料：

[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（）。

A. 45℃
B. 35℃
C. 30℃
D. 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（）。

A. 2mm
B. 1mm
C. 0.2mm
D. 0.1mm

[单选题]油润滑艉轴密封装置的防蚀衬套选用（）制造。

A. 碳钢或铸铁
B. 镀铬钢套或不锈钢
C. 黄铜或不锈钢
D. 镀铬钢套或铸铁

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

A. Diesel oil
B. Hydraulic oil
C. Lube oil
D. Mineral oil

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

A. governor
B. safety valve
C. reducing valve
D. feed water regulator

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

A. atmosphere
B. the fresh water
C. compressed air
D. chemical compound

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

A. leaky injector
B. water in the gas
C. too heavy oil
D. water in the oil

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

A. heat conduction into the injected fuel oil
B. heat conduction into the water jacket wall
C. water circulation through passages in the holder
D. fuel oil circulation through passages in the holder

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