[Daily question] [Static Equipment Exchange Edition...Question 18] Multiple choice question on January 18, 2019...Good luck every year

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bg4.png [Daily question] [Static Equipment Exchange Edition...Question 18] Multiple choice question on January 18, 2019...Good luck every year. 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. The 2018 Haichuan "Double Ten Best" outstanding member selection activities were officially launched (the first phase: Recommend outstanding members in your mind) https://bbs.hcbbs.com/thread-2243161-1-1.html There are 19 more fortunes to be collected, so act quickly if you are interested. A large summary of personal integrated information - attached with [Coating Information - Integrated Collection] - to add color to the New Year https://bbs.hcbbs.com/thread-2259051-1-1.html 1. External pressure The allowable external pressure of the spherical shell is related to the following parameters (). A. Corrosion allowance B. Outer diameter of spherical shell C. Material tensile strength D. Elastic modulus ------ 2. In the GB150 external pressure cylinder calibration, Do/δe () is used as the boundary to distinguish thin-walled cylinders from thick-walled cylinders. A. ≥10B. ≥20C. ≥4.0-------- 3. The structure has the ability to resist external force. This property of being able to restore its original shape and size after the external force is removed is called elasticity. () A. Correct B. Wrong ----------- Answer 1. BD 2. B 3. A 1. Comment: This question is a basic concept test question, examining the relevant factors that affect the allowable external pressure. 2. Comments: This question is a basic concept question. Since the calculation methods used for thin-walled cylinders and thick-walled cylinders are different, the distinction between the two is very important, otherwise it will cause great errors. The calculation formula of GB150 is the calculation formula for thin-walled cylinders (GB150.3 4.3.2). 3. Comments: This is the basic definition of material mechanics, and the pressure components of pressure vessels should basically have this property.