【Pump Technology Edition: Daily Question】March 19, 2020 (Section benefit: 10 Wealth points as a reward for answering correctly before the answers are revealed)

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138. When a flexible rotor operates below its critical speed, the rotor can be considered as (  ).   A. Flexible rotor B. Rigid rotor C. Elastic rotor Answer to question 137 on March 18, 2020: A. 137. To eliminate the precision variations caused by internal stresses in cast iron guides, it is necessary to carry out (A) treatment before processing. A、Ageing B、Tempering ； C. Quenching (Answers are released the day before they’re made public; 10 wealth points for correct answers before the release, 5 wealth points for correct answers after the release, and 3 wealth points for just participating). I’ve been a bit busy lately, which means it’s taking some time to post questions and provide feedback on scores. 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!