【Daily Question】Hydrogen production and hydrogenation technology version 20190531

2019-05-31View Original

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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: The lubricating oil commonly used in centrifugal pumps is ( ). A. N46 and N68 refrigeration oils B. N46 and N68 hydraulic oils and turbine oils C. 90# and 150# heavy-duty gear oils D. WA150 and WA220 worm gear oils Answer: B 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 released automatically after two days.

Reply #22019-05-31

B, N46 and N68 hydraulic oils, turbine oils

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【Daily Question】Hydrogen production and hydrogenation technology version 20190531

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