【Daily Question】2015.07.01 Heat exchange tubes (2 wealth points for a reply, +3–8 wealth points if the answer is correct)

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The Machinery Section has introduced the \"One Question per Day\" feature, which not only fosters an active atmosphere for technical exchanges and guides the direction of such exchanges, but also provides users with financial rewards to help them experience various cool features. Multiple-choice question: Regarding the heat exchange tubes, which of the following statements is correct? A. Splicing is not allowed. B. Corrosion margin must be considered. C. Seamed tubes can sometimes be used. D. Threaded heat exchange tubes can be used. 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 solution and 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 topic are asked to reply/comments in this post to inform us, and we will then award them 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 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 earning +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)