【Daily Question】Catalytic Coking Reformate Blending Version 20180524

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Participation: Prize 1 Wealth； Correct answer: Reward of 3 wealth points ； Note: This post is valid for 48 hours. Single-choice question: During the initial airtightness testing phase of the hydrogen system (　　). A. Hermetic sealing and gas displacement are carried out simultaneously. B. Hermetic sealing is done first, followed by gas displacement, to save nitrogen. C. Air pressure testing is performed first, then nitrogen displacement. D. Gas displacement is completed successfully first, after which hermetic sealing takes place. 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 published automatically after two days. “My Device, My Home – Large-scale Original Photo Sharing Event (Phase 2): https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1868167&extra=page%3D1 【Q&A】Summary of Catalytic Coking and Reforming Oil Blending Data for 2017–2018~~Continuously being updated: https://bbs.hcbbs.com/thread-1826018-1-1.html 【Daily Question】Summary of Catalytic Coking and Reforming Oil Blending Data for 2017–2018~~Continuously being updated: https://bbs.hcbbs.com/thread-1811219-1-1.html