单项选择题
A.defrosting B.de-oiling C.demulsifying D.dehumidifying
Any carbon built up on surfaces must be washed away by ...
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
The （） of an oil refers to its ability to mix with wate...
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
Obviously, for a given fuel oil, its pour point is （） i...
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
