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
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 （）.
单项选择题 Cylinder oil is a high viscosity mineral oil, with a （） machined to the anticipated sulfur content of the fuel.
