A．n 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

[名词解释] 单体附加系（Monosomic additive line）

[名词解释] 二体附加系（disomic additive line）

[名词解释] 双单体附加系（double monosomic additive line）

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