A.High oxygen concentration
B.Low pH
C.Proper alkalinity
D.All of the above
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A.525 RPM
B.775 RPM
C.1550 RPM
D.1800 RPM
A.low firing pressure and low exhaust temperatures
B.low firing pressure and normal exhaust temperatures
C.high firing pressure and low exhaust temperatures
D.high firing pressure and high exhaust temperatures
A.large conical springs
B.compressed air pressure
C.hydraulic pressure
D.exhaust gas pressure
A.hour
B.day
C.week
D.month
A.Engine is hard to start
B.Engine misses
C.Surges at governed RPM
D.Coolant temperature is too low
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Maximum horsepower of a diesel engine is attained （）.
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Lube oil cannot be efficiently filtered if its （）.
White smoke exhausting from an operating diesel engine may indicate （）.