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This post was last edited by 103388716 on 2017-2-7 00:57. To thank all the users for their support of this section, a new round of activities is being launched 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 True or False: When switching to the backup pump, after it starts and is found to be functioning properly, slowly open the outlet valve of the backup pump, while gradually closing the outlet valve of the pump that is currently in operation (the switching process must be carried out in close coordination to minimize fluctuations in outlet flow and pressure). ( ) Correct: (√) Lucky number: 2. Petrochemical Zone – The “Creative Ideas” campaign for energy savings: http://bbs.hcbbs.com/thread-1669271-1-1.html Xiaomi phones are waiting for you to claim them