- 搜標(biāo)題
- 搜題干
- 搜選項(xiàng)
單項(xiàng)選擇題
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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