单选题A lubricant often has to perform many duties in any situation, in addition to its fundamental job of （）.Aresisting oxidizationBreducing frictionCpromoting moving speedDdeveloping inertia
单选题
A lubricant often has to perform many duties in any situation, in addition to its fundamental job of （）.
A
resisting oxidization
B
reducing friction
C
promoting moving speed
D
developing inertia
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