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This post was last edited by liuquan1100 on 2017-8-7 22:23. [Daily Question No. 219] 2017.08.07 (Judgment question): The operation of switching the feed water pump in a hydrogenation unit must be carried out by at least two persons, in order to prevent high-pressure gas from flowing back into the reaction system. The reference answers will be visible after () reply; points can be earned by answering the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) Correct. Scoring criteria: Incorrect answers earn 2 wealth points; *incomplete* answers score 3–8 points. Correct answers with a detailed explanation, along with supplementary *answers* to cover any gaps, earn 15–20 wealth points. Please use these criteria for scoring. Note: If there are editing records after answering, only points will be awarded to those who participated. For continuous malicious spamming, 2 points will be deducted each time, with no upper limit. Pure numbers, pure emojis, or random letters that have nothing to do with the answer are all considered malicious spamming; points will start to be deducted after three warnings. 2017 Q&A Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657794-1-1.html 2016 Q&A Summary Thread (updates completed) http://bbs.hcbbs.com/thread-1597792-1-1.html Petrochemical Sector – “Creative Ideas for Energy Saving” Campaign (the second phase is in full swing) http://bbs.hcbbs.com/thread-1666758-1-1.html (Source: Haichuan Chemical Industry Forum Website)