【Daily Question No. 129】2017.05.09
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【Daily Question No. 129】May 09, 2017: During the scheduled shutdown of the device, the concentration of hydrogen and hydrocarbons in the system, after being replaced with nitrogen, must not exceed ( ). A、0.05% B、0.5% C、5% D、1%. The reference answer can be seen after responding; points will be awarded if the key points are answered correctly. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) B rating 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. 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
According to the device specifications, during the shutdown process, the concentration of hydrogen plus hydrocarbons in the system, after being replaced with nitrogen, must not exceed (B). A、0.05% B、0.5% C、5% D、1%
This post was last edited by RSchufaqi on 2017-5-9 08:08: B (Repeated answer, please delete it)