單項(xiàng)選擇題As for turbine oil, contact with water in the form of steam will be inevitable so good （） properties will be essential.

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


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1.單項(xiàng)選擇題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

2.單項(xiàng)選擇題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

3.單項(xiàng)選擇題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

4.單項(xiàng)選擇題The higher the cetane number, （） the ignition quality of the fuel.

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

5.單項(xiàng)選擇題The specific gravity of fuel oil is a （）.

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