[Daily question] [Static Equipment Exchange Edition...Question 27] Multiple-choice question on January 27, 2019... Bon voyage

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This post was last edited by kareale88 on 2019-1-26 18:15 bg4.png [Daily question] [Static Equipment Exchange Edition...Question 27] Multiple-choice question on January 27, 2019... Questions will be posted at night recently. Please pay more attention and understanding. Please fill in the answers (multiple choice, single choice, single choice) in order. Bonus rules: Participation will reward 1 wealth, and correct answers will reward 3 wealth for each item, with a maximum of 10 wealth. This topic is valid for two days and will not be graded for more than two days and 48 hours. ---------------------Voting for the final candidates of the 2018 Haichuan "Top Ten" Outstanding Members is in progress... https://bbs.hcbbs.com/thread-2273209-1-1.html--------------------- You already understand these requirements. I won’t go into details about how many detours you have to take. Hey, it’s a valuable contribution of information. https://bbs.hcbbs.com/thread-2268245-1-1.html ---------------------Integration of the first issue of [Small Activity Posts] - Transferring again - [Summary of one chain] - Appreciation starts with intention https://bbs.hcbbs.com/thread-2275595-1-1.html--------------------- The first issue of [Discussion Post] Integration - Re-transfer - [Summary of One Chain] - Appreciation starts with intention https://bbs.hcbbs.com/thread-2275557-1-1.html---------------------1 , K in the calculation formula of the elliptical head is called the shape coefficient, and its meaning is the ratio of () stress on the head and () film stress on the butt cylinder. A. Maximum film ； B. Maximum bending ； C. Maximum total ； D. circumferential direction ； E. Axial. ---------------------2. According to steel plate standards, a 16mm thick Q235-B steel plate with a set of impact energy (J) values ​​at 20°C is a qualified product. A. 17, 30, 32B. 17, 40, 50C. 28, 30, 31---------------------3. Strength welding is suitable for occasions where the heat exchanger is subject to vibration or fatigue. () A. Correct B. Wrong------------------------Answer 1. CD 2. C 3. B 1. Comments: This question is a basic theory test question. Deepen understanding of standards. 2. Comments: See, this question tests the designer's basic concept of impact energy result evaluation. Because there is "17" in the first two sets of data, which is less than 70% of the qualified index, it cannot be a qualified product. 3. Comments: The reviewer should understand the suitability of the structure. See GB151 6.6.2.