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This post was last edited by LQ198619 on 2017-2-27 08:15. Gas is used to displace air, and the oxygen content in the gas inside the equipment is considered acceptable when it is not greater than (). (Multiple-choice question) A、0.01; B、0.02; C、0.05 ； D, 0.1 ； Correct**: A – One question per day reward rule: 5 wealth as a participation prize ； 10 Wealth for correct answer ； Note: Questions from the same day will receive full feedback if answered on the same day; answering them the next day earns 5 wealth points. This post is valid for 48 hours. Friendly reminder: (This is a summary of the weekly topics discussed in the Petrochemical Technology Consultation Center; those who are interested can visit the link to participate and earn rewards.) Summary post of the weekly topics from the “Petrochemical Technology Consultation Center”: http://bbs.hcbbs.com/thread-1669318-1-1.html. Summary post for the “Daily Question” section in the Petrochemical Deep Processing area – updated daily by the forum moderator: http://bbs.hcbbs.com/thread-1496481-1-1.html. Event in the Petrochemical section titled “Creative Ideas for Energy Saving”: http://bbs.hcbbs.com/thread-1666758-1-1.html. Xiaomi phones are available for grabs. Summary post for collecting chemical technology materials in the “Petroleum and Chemicals Section”: http://bbs.hcbbs.com/thread-1654603-1-1.html. Many prizes are waiting for you