【Daily Question】8.14 Reply +2； To 3

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This post was last edited by ren6602121 on 2015-8-15 at 19:31. In order to increase the popularity of the container section, an \"One Question per Day\" activity was initiated under the guidance of the leaders, aiming to foster active technical exchanges while also providing financial rewards to users. In the calculation of the tube sheet for fixed-tube-sheet heat exchangers, when the values of A, B, and C calculated under various operating conditions with temperature differences do not meet the strength requirements, it is necessary to install expansion joints. A) Axial stress in the shell, σC B) Axial stress in the heat exchange tubes, σt C) Pulling force between the heat exchange tubes and the tube sheet, q D) Radial stress in the tube sheet, σr Please reply with the answer you think is correct; participating in the quiz earns +1 wealth point (points are added automatically according to the rules; no additional points or comments will be given if your answer is incorrect). Those who get all answers right will receive an additional +3 wealth points. If you provide a detailed explanation for the questions or answers, you will receive extra wealth points as well. If your answer is correct and your explanation is accurate, it will be marked as the best reply. Feel free to answer; please do not reply repeatedly ； If a, b, c, and d are all correct, select e; answering a, b, c, d, e will result in no points. Note: We will close this post after 24 hours to reveal the answers and explanations, as well as the best response (the best help provided). Charisma Reward: If you post a topic in this section within two days to provide a detailed explanation of the knowledge points covered in this question, please reply to this post to inform us, and we will have a moderator grant you charisma points. 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 and opinions. After registration, we will rank participants based on the content of their posts: the last-place participant will receive +1 charm point, the second-to-last participant +2 charm points, and so on, with the highest score earning +5 charm points. http://bbs.hcbbs.com/thread-1381938-1-1.html Inviting friends to join earns wealth. http://bbs.hcbbs.com/thread-1389197-1-1.html Seeking sponsors for naming rights