When separating the lube oil without additive, it is usually cleaned with hot water; the aim is to remove （） from it.<br>A:acid<br>B:sludge<br>C:mechanical impurity<br>D:salinity

When separating the lube oil without additive, it is usually cleaned with hot water; the aim is to remove （） from it.
A:acid
B:sludge
C:mechanical impurity
D:salinity

出自：海船船员证

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