【单选题】Generally the function of lubrication is to form. of a film of lubricant between any two surfaces that have relative _____, so that surfaces dont get touch with each other.
【单选题】根据内容回答题。 panic A panic is a form. of collective in which a group of people, face with an immediate threat, re- act in an uncoordinated and irrational way. Their behawor is uncoordinated in the sense t...