单项选择题The cylinder oil will have to neutralize the acidic products of combustion and have good () properties to keep the metal surfaces clean.

A.detergent
B.de-oiling
C.defrosting
D.demulsifying


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2.单项选择题Any carbon built up on surfaces must be washed away by () additives and held in suspension by a () additive.

A.dispersant;detergent
B.detergent;dispersant
C.dispersant;dispersant
D.detergent;detergent

3.单项选择题The () of an oil refers to its ability to mix with water and then release the water in a centrifuge.

A.oxidation resistance
B.carbon-forming tendency
C.demulsibility
D.acidity

4.单项选择题Obviously, for a given fuel oil, its pour point is () its cloud point.

A.lower than
B.higher than
C.as same as
D.better than

5.单项选择题The higher the cetane number, () the ignition quality of the fuel.

A.the worse
B.the better
C.the smaller
D.the greater

6.单项选择题The specific gravity of fuel oil is a ().

A.absolute value
B.relative value
C.constant value
D.set value

9.单项选择题When considering the lowest fuel system operating temperature, () are important.

A.specific gravity or relative density
B.open flash point and closed flash point values
C.higher calorific and lower calorific values
D.cloud point and pour point values