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.

A.compression
B.maximum
C.rated
D.oil

A.the viscosity index
B.the fuel oil contents
C.the starting speed
D.the reading at the rack

A.have nothing to do with
B.having nothing to do with
C.have much to do with
D.having much to do with