问润滑脂等级分类中NLGI#等级是什么的缩写？

NLGI Grade is a widely used classification for lubricating greases. It was established by the National Lubricating Grease Institute. Greases are classified in one of nine grades based on their consistency。NLGI:National Lubricating Grease Institute因为它是被这个学院制定的。等级为1-9按照润滑脂的浓度。