單項(xiàng)選擇題

Higher than normal temperature air passing through the intake of a diesel engine will result in（）

A.greater overall efficiency
B.greater fuel economy
C.lower horsepower
D.lower compression ratio

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單項(xiàng)選擇題
Air scavenging of a diesel engine cylinder（）
A.blows out the exhaust gases
B.supplies oxygen for combustion
C.cools the valves and cylinder walls
D.all of the above
單項(xiàng)選擇題
The term diesel engine scavenging means（）
A.delivering more air into the cylinder than it would normally receive during an ordinary charging process
B.forcing the products of combustion out of the cylinder with the fresh air charge
C.collecting the air charge at the cleaner
D.combustion and expansion of hot gas