【Daily Question】Hydrogen production and hydrogenation technology version 20200512

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Participation: Prize 1 Wealth； Correct answer: Reward of 3 wealth points ； Note: This post is valid for 48 hours. https://bbs.hcbbs.com/static/image/hrline/2.gif Multiple-choice question: What is the purpose of the three-stage filtration of lubricating oil? A. To prevent impurities from entering the lubricant during transportation. B. To prevent impurities from entering the lubricant during handling. C. To prevent impurities from entering the lubricant during filling. D. To prevent impurities from entering the lubricant during use. Answer: C. Your participation is the greatest support for our work. Giving roses to others leaves a pleasant fragrance in one’s own hands. https://bbs.hcbbs.com/static/image/hrline/1.gif https://bbs.hcbbs.com/static/image/hrline/2.gif Note: The answers will be published automatically after two days.