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To thank all marine enthusiasts for their support of this section, we are launching a new round of activities as a way to give back to everyone. “\"One question per day, special offers section\" – this campaign will have posts published irregularly, 1-5 times per month. Please pay close attention to the \"Catalytic Cracking, Coking, and Reforming Edition\" page and follow me closely to avoid missing out on great opportunities to earn money: lol. Before participating in the campaign, please read the rules carefully: 1. A prize of 5 wealth points for participation, and 15 wealth points for correct answers ； 2. After answering, hide the ** – there will be a number following it; floors whose last digit matches this number will receive an additional 15 wealth points as a reward ； 3. Each person is allowed to reply only once; those who deliberately post repeatedly will be dealt with, you know what I mean:@ ； 4. The topics presented in this post are not subject to any restrictions ； 5. The validity period of this post is 96 hours; no rewards will be given after it expires ； 6. The owner of this post holds all rights to interpretation. http://bbs.hcbbs.com/static/image/hrline/5.gif Fill in the blank: When working in confined spaces, entry is prohibited if the oxygen level in the area is below ( ), to avoid suffocation accidents. Correct answer: 18% Lucky number: 0 ======================== Petrochemical Zone – “Creative Ideas for Energy Savings” event (Sponsors sought; highest returns ever offered) http://bbs.hcbbs.com/thread-1666758-1-1.html Sponsors are being sought for this event; those interested can contact the event organizer. The Petrochemical Deep Processing version – an event to share pictures of chemical equipment has started! A vast amount of wealth, as well as HChuan coins, are waiting for you to claim them: http://bbs.hcbbs.com/thread-1760733-1-1.html. Notice regarding the collection of chemical engineering technical materials in the \"Petroleum and Chemicals Section\": http://bbs.hcbbs.com/thread-1614796-1-1.html