单项选择题The Oil Record Book, as a part of the ships official logbook, shall be kept on board and preserved for a period of ().

A.3 years after making the first entry
B.2 years after the last entry
C.3 months after last entry
D.3 years after the last entry


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5.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

6.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

7.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

8.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

9.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