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
单项选择题 Obviously, for a given fuel oil, its pour point is （） its cloud point.
单项选择题 The higher the cetane number, （） the ignition quality of the fuel.
单项选择题 The specific gravity of fuel oil is a （）.
