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单选题
552. 滑油的另一个重要作用是保护金属表面不被腐蚀。
A
Another important function of lubricating oil is to protect the corroded metal surfaces.
B
Another important task of the oil is to protect the metal surfaces from corrosion.
C
Preventing the metal surface from further corrosion is the other essential function of the lube.
答案解析
正确答案：B
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