The major source of chemical contaminants in hydraulic fluid is （）.<br>A:microscopic steel shavings<br>B:abrasive waste<br>C:anti-oxidant compounds<br>D:oxidation by-products

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

出自：海船船员证

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