A.high combustion temperature
B.high compression pressure
C.cracked cylinder liner
D.fuel with a high vanadium content
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A.low combustion temperature
B.a leaking fuel nozzle check valve
C.late fuel injection
D.plugged oil-scraper ring hole
A.the engine is overloaded
B.the engine is cold
C.there is too much lube oil in the cylinders
D.the turbocharger is fouled
A.high exhaust temperature
B.high lube oil temperature
C.low turbo-charger speed
D.low cooling water temperature
A.a cracked liner
B.burning lube oil
C.an overloaded engine
D.insufficient combustion air
A.water supply
B.fuel oil supply
C.lube oil supply
D.exhaust damper
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（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.