【Pump Technology Edition: Daily Question】March 1, 2020 (Section benefit: 10 wealth points as a reward for answering correctly before the answers are revealed)

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120. For medium-speed, medium-load sliding bearings operating at high temperatures, it is advisable to use ( ) as the material for the bearing shells or bushings. A. Gray cast iron B. Cast bronze alloy C. Bearing alloy. Answer to question 119 on February 29, 2020: B. 119. Centrifugal pumps belong to (B).   A. Positive-displacement pump B. Vane pump C. Rotary pump (Answers will be released the day before they are officially announced. Those who get the answers right before the announcement will receive 10 wealth points, those who get them right after the announcement will receive 5 wealth points, and those who participate will receive 3 wealth points.) I’ve been a bit busy lately, so it’s taking some time to post questions and provide feedback on answers. But no matter how busy or late it gets, I will still post things and respond to everyone. Thank you all for your continued support!