【Daily Question 2019】Hydrogen production and hydrogenation section – Questions No. 5-17

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【Daily Question 2019】Hydrogen production and hydrogenation section – Questions 5-17: During the shutdown of hydrogenation and hydrogen-related systems, what should be used for displacement? A. Air B. Nitrogen C. Water vapor D. Hydrogen. 2 Points will be awarded for a correct answer; those who get it right will receive an additional 2 points, while those who get it wrong will not receive any points. Please have the person in charge promptly update the score for the question setter. Temporarily, the top 60 players will receive +1 to automatic wealth acquisition. 3 correct for wealth, 1 incorrect for wealth ； Mass posting of posts – rated based on the lowest score ； Replies that are unrelated to the answer are considered spam and will be deleted immediately. For management purposes, if you need to view content from a few days ago, please go to https://bbs.hcbbs.com/home.php?mod=space&uid=3862647&do=thread&view=me&from=space through the summary post below