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For a toothed coupling with an outer diameter of 250 mm, as in case of coupling No. 164, the end face clearance of the toothed sleeve is generally not less than (〕. A、2mm B、2.5mm C、5mm Answer to question 160 dated April 10, 2020: A. After the machine has been leveled using shims and the inspection shows it is satisfactory, it should be secured immediately on both sides of the shim set by welding (A). (Iron casters do not require welding: A. Spot welding; B. intermittent welding; C. full welding. Answer to question 161 dated April 11, 2020: B. For the purpose of equipment maintenance, the surface of the foundation where secondary grouting is to be applied must be washed clean with water and made wet.) When the ambient temperature is below (B)°C, anti-freezing measures should be taken, and surface water accumulated on the foundation should be removed. A. -10 B. 0 C. 5 The answer to question 162 on April 12, 2020 is B. For mechanical equipment with a rotation speed of 1500–3000 rpm, the clearance at the top of the thin-walled bearing shells is (B). A. (0.8～1.2)d/1000 B. (1.2～1.5)d/1000 C. (1.5～2)d/1000 The answer to question 163 on April 13, 2020 is B. For radial self-aligning bearings with multiple oil wedges, the clearance between the bearing shells is generally set at (B). A. (1.1–1.2) days/1000 B. (1.4–1.8) days/1000 C. (0.8–1.0) days/1000. The answers will be announced the day before they are released; those who guess correctly before the announcement will have a few lucky forum members randomly selected to receive 10 wealth points each, while those who get it right after the announcement will receive 5 wealth points. Knowledge is priceless – what matters is participation. I’ve been a bit busy lately, so I’m slower at posting questions and giving feedback, but no matter how busy or late it gets, I will still post and respond to everyone. For the development of the forum and for your own progress as a forum member, please give me your support. Thank you very much, and I also thank my friends who have supported me throughout this journey – thank you all.