【Daily Question】2016.01.25 Welding grooves (2 wealth points for a reply; +3–8 additional wealth points if the answer is correct)

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The Machinery Section has introduced the 【Daily Question】 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: When welding sheets with a large thickness, it is advisable to use ( ) whenever possible. A. X-shaped groove B. U-shaped groove C. V-shaped groove http://down1.hcbbs.com/forum/201601/22/105116cfiiiifbis6si3rt.jpg.thumb.jpg Please note: We will close this thread after 24 hours, and at that time we will announce the best reply (the most helpful answer), along with the solution and explanation. The competition for \"Active Experts and Weekly Stars\" in the Machinery section has begun: http://bbs.hcbbs.com/thread-1489069-1-1.html. A comprehensive guide to preventing equipment from freezing over winter: http://bbs.hcbbs.com/thread-1502793-1-1.html