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单选题

Liquid soap is a good, nonstaining lubricant for most seals.

A Soap solution is a good, free of contamination lubricant for most seals;

B Liquid soap is a good, contaminative lubricant for most seals;

C Liquid soap is a good, pungent lubricant for most seals;

正确答案:A (备注:此答案有误)

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