单项选择题
The process of scavenging a two-stroke/cycle diesel engine serves to（）
A.improve fuel flow volume B.cool the exhaust valves C.reduce the intake air charge density D.increase the temperature of exhaust gases
单项选择题 Which of the listed bearing types is an example of a solid bearing?（）
单项选择题 A distorted spray pattern from a fuel injector can cause a diesel engine to have （）
单项选择题 Why are some diesel engine cylinder liners plated on the wearing surface with porous chromium?（）
