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

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单项选择题

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

单项选择题

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

单项选择题

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