单项选择题Enhanced procedures concerning the exercise of () have been developed to allow intervention in the ease of deficiencies deemed to pose a danger to persons, property or the environment.

A.port state control
B.flag state control
C.fire and boat drill
D.Safety inspection


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4.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

5.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

6.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

7.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

8.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