An additive used to improve the ability of a lube oil to reduce friction is known as a/anA.suppressant additiveB.dispersant additiveC.extreme pressure additiveD.viscosity improver additive

题目内容（请给出正确答案）

An additive used to improve the ability of a lube oil to reduce friction is known as a/an

A.suppressant additive

B.dispersant additive

C.extreme pressure additive

D.viscosity improver additive

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