Why are some diesel engine cylinder liners plated on the wearing surface with porous chromium?（）<br>A:The chromium will not wear out the piston rings<br>B:The chromium strengthens the liners in the way of the scavenging air ports<br>C:Chromium eliminates the need for oil scraper rings<br>D:Pores in the plating aid in maintaining the lube oil film

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

出自：海船船员证

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