PAO and esters are the most useful base-stocks in synthetic lubricatingoils.
PAO和酯类油是应用最广泛的合成基础油料。
2
X is not used over the range of temperatures at which mineral lubricatingoils are satisfactory, but rather above or below these temperature limits.
在X并不使用温度范围内润滑油脂在哪种矿物是令人满意的，而是高于或低于这些的温度范围。
3
Most petroleum products, including kerosenes, fuel oils, lubricatingoils, and waxes, are fractions of petroleum that have been treated to remove undesirable components.