A.valve overlap
B.volumetric efficiency
C.turbulence of the air change
D.fuel efficiency
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A.greater overall efficiency
B.greater fuel economy
C.lower horsepower
D.lower compression ratio
A.blows out the exhaust gases
B.supplies oxygen for combustion
C.cools the valves and cylinder walls
D.all of the above
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
A.an incorrect diesel generator governor speed droop adjustment
B.a faulty reverse power relay within the main circuit breaker assembly
C.unsynchronized isochronous load distribution adjustments
D.a different speed setting on each unit
A.improve fuel flow volume
B.cool the exhaust valves
C.reduce the intake air charge density
D.increase the temperature of exhaust gases
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（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
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