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The last edit to this post was made by 955559 on 2017-7-31 at 16:27. [Daily Question No. 033] 2017.02.02 In hydrogenation units, whether to install hydrogen circulation desulfurization facilities is determined based on the level of （ ） in the feedstock. A. Olefin content B. Oxygen content C. Nitrogen content D. Sulfur content. The reference answers will be visible after replying; scoring is possible by identifying the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) The D New Normal Cup – 2016 HAICHUAN Top 10 Members voting is now underway; choose the member you care about the most (please cast your valuable vote for those in the Petrochemical Division). http://bbs.hcbbs.com/thread-1667649-1-1.html Summary post of Q&A questions for 2017 (updates available now). http://bbs.hcbbs.com/thread-1657793-1-1.html Summary post of daily questions for 2017 (updates available now). http://bbs.hcbbs.com/thread-1657794-1-1.html Summary post of Q&A questions from 2016 (all updates completed). http://bbs.hcbbs.com/thread-1597792-1-1.html Third phase of the HAICHUAN Outstanding Management Members selection contest. http://bbs.hcbbs.com/thread-1655902-1-1.html “Creative Ideas for Energy Saving” campaign in the Petrochemical Division. http://bbs.hcbbs.com/thread-1666758-1-1.html Xiaomi phones available for winning. Summary post collecting chemical industry technical materials from the “Petrochemical Section”. http://bbs.hcbbs.com/thread-1654603-1-1.html Many prizes waiting to be won (Source: HAICHUAN Chemical Forum)