單項(xiàng)選擇題

Which of the listed bearing types is an example of a solid bearing?（）

A.Piston wrist pin bushing
B.turbine bearing
C.Spring bearing
D.Diesel engine main bearing

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單項(xiàng)選擇題

A distorted spray pattern from a fuel injector can cause a diesel engine to have （）

A.higher firing pressure
B.more power output
C.lower fuel pressure
D.less power output

單項(xiàng)選擇題

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