单选题The major source of chemical contaminants in hydraulic fluid is （）.Amicroscopic steel shavingsBabrasive wasteCanti-oxidant compoundsDoxidation by-products
单选题
The major source of chemical contaminants in hydraulic fluid is （）.
A
microscopic steel shavings
B
abrasive waste
C
anti-oxidant compounds
D
oxidation by-products
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