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This post was last edited by 955559 on 2017-7-31 at 16:22. [Daily Question No. 048] On 2017.02.17, when the liquid level in the crude oil buffer tank drops rapidly, the pressure at its top will (). A. Decrease B. Increase C. Remain unchanged D. Decrease first then increase. Answer by indicating the key point to score points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) A. Petrochemical Area – “Creative Ideas for Energy Saving” event: http://bbs.hcbbs.com/thread-1666758-1-1.html. The New Normal Cup – voting for the top 10 members of HaiChuan in 2016 is now underway; vote for the member you care most about (please cast your valuable vote for those in the Petrochemical Area). http://bbs.hcbbs.com/thread-1667649-1-1.html. Summary post of Q&A questions for 2017 (updates available): http://bbs.hcbbs.com/thread-1657793-1-1.html. Summary post of daily questions for 2017 (updates available): http://bbs.hcbbs.com/thread-1657794-1-1.html. Summary post of Q&A questions from 2016 (updates completed): http://bbs.hcbbs.com/thread-1597792-1-1.html. Third round of selection for outstanding management members of HaiChuan: http://bbs.hcbbs.com/thread-1655902-1-1.html. Petrochemical Area – “Creative Ideas for Energy Saving” event: http://bbs.hcbbs.com/thread-1666758-1-1.html. Xiaomi phones are up for grabs. Summary post collecting chemical engineering-related materials from the Petrochemical Section: http://bbs.hcbbs.com/thread-1654603-1-1.html. Many prizes are waiting for you (Source: HaiChuan Chemical Forum)