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.<br>A:gravity<br>B:motion<br>C:ratio<br>D:density

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:gravity
B:motion
C:ratio
D:density

出自：海船船员证

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