【Daily Question】Hydrogen production and hydrogenation technology version 20190611

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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: When testing the cold oil pump, which of the following steps is not necessary? ( ) A. Fill the bearings with lubricating oil to the specified level. B. Rotate the pump’s handle to ensure there is no sticking. C. Open the inlet valve and slightly open the outlet vent valve. D. Open the preheating valve to warm up the pump body and achieve uniform temperature. Answer: D. 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.