单项选择题
Why are some diesel engine cylinder liners plated on the wearing surface with porous chromium?（）
A.The chromium will not wear out the piston rings
B.The chromium strengthens the liners in the way of the scavenging air ports
C.Chromium eliminates the need for oil scraper rings
D.Pores in the plating aid in maintaining the lube oil film
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A.decrease until the engine speed increases
B.increase as the load increases
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Which of the following conditions is most likely to occur when unburned fuel contaminates the crankcase of a diesel engine?（）
A.Lube oil is diluted and its viscosity is reduced
B.Sulfuric acid is formed
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