【Daily Question No. 145】2017.05.25

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【Daily Question No. 145】May 25, 2017: Before stopping a centrifugal pump, it is necessary to first close ( ). A. The inlet valve B. The outlet valve C. Both the inlet and outlet valves. Reply to see the reference answer; scoring is possible by identifying the key point. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) Scoring criteria for Exit Valve B: 2 Wealth points for incorrect answers; *incomplete* answers earn 3–8 points. 10 Wealth points are given for correct answers accompanied by a detailed explanation; answers that are correct but lack sufficient details 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