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【Daily Question No. 226】On 2017.08.14, under operating conditions, hydrogenation catalysts require that their metal components exist in () form. A. Oxidized state B. Reduced state C. Sulfided state D. Acidic state. The reference answers will be visible after clicking \"Reply\"; scoring is possible by identifying the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) The C daily quiz closes after 7 days, and the answers are displayed automatically. (2017-8-19) Scoring criteria: A wrong answer earns 2 Wealth points; an *incomplete* answer yields 3–8 points. A correct answer with a detailed explanation grants 10 Wealth points, while a correct answer with insufficient additional *answers* earns 15–20 Wealth points. Please score according to these criteria. Note: If there are editing records after answering, only those who participated will be credited points. For continuous malicious spamming, 2 points will be deducted each time, with no upper limit. Pure numbers, pure emojis, or random letters unrelated to 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 Zone – “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)