單項選擇題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


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

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

2.單項選擇題The specific gravity of fuel oil is a ().

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

5.單項選擇題When considering the lowest fuel system operating temperature, () are important.

A.specific gravity or relative density
B.open flash point and closed flash point values
C.higher calorific and lower calorific values
D.cloud point and pour point values