【Daily Question】 6.22 Pressure Vessel Media: 2 points for replying, +3 for a correct answer, +5 for a perfect answer

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The last edit to this post was made by ren6602121 on 2015-6-24 at 11:41. The Mechanical Forum has introduced the \"Question of the Day\" feature, which not only helps to foster an active atmosphere for technical discussions and guide the direction of such exchanges but also provides users with financial rewards, enabling them to experience various cool features. Multiple-choice question: Among the toxic media in pressure vessels, those that belong to the first group are (A B). A. Aniline B. Formaldehyde C. Ethylamine D. Di**amine. The scope of coverage is limited; the question statement may not be precise. It primarily tests the toxicity of the medium. Please note: we will close this thread after 24 hours, and at that time we will announce the best response (the most helpful answer), along with the correct answer and its explanation. Charisma Reward: Those who post a topic in this section within two days to provide a detailed explanation or discussion of the knowledge points related to this question are asked to reply/comments in this post to inform us, and we will have a moderator grant them + Charisma. It is not allowed to simply copy and paste; original content is preferred, with at least some organization by the user along with personal insights. After registration, we will rank based on the content of the posts: the last-place contestant will receive +1 charm, the second-to-last +2 charm, and so on, with the highest score getting +5 charm. http://bbs.hcbbs.com/thread-1381938-1-1.html Earning wealth by inviting friends http://bbs.hcbbs.com/thread-1389240-1-1.html [Mechanical Section] Collection of essential knowledge 【Seeking manufacturer sponsorship】 (long-term campaign)