【Daily Question No. 171】2017.06.20

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【Daily Question No. 171】On June 20, 2017, when starting a secondary reciprocating compressor, it is generally necessary to carry out operations in ( ). A. First, open valves No. 1 and No. 2 of the primary circuit. B. First, close valves No. 1 and No. 2 of the primary circuit. C. First, open valve No. 1 of the primary circuit and close valve No. 2 of the primary circuit. D. First, open valve No. 2 of the primary circuit and close valve No. 1 of the primary circuit. The reference answer will be visible after responding; scoring is possible by identifying the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) Scoring criteria: 2 Wealth points for incorrect responses; *incomplete* answers earn 3–8 points. 10 Wealth points are given for correct answers accompanied by detailed explanations; responses 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 those who participated will be given points. 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 (updating now) http://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updating now) http://bbs.hcbbs.com/thread-1657794-1-1.html 2016 Q&A Summary Thread (already updated) http://bbs.hcbbs.com/thread-1597792-1-1.html