单选题An additive used to improve the ability of a lube oil to reduce friction is known as a/an （）.Asuppressant additiveBdispersant additiveCextreme pressure additiveDviscosity improver additive
单选题
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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