【Pump Technology Edition: Daily Question】February 1, 2020 (Spring Festival bonus: 10 Wealth points for those who answer correctly before the answers are revealed)

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91. The grouting work for the secondary grouting layer should generally be carried out within (????) hours after the concealed works have been inspected and found to be satisfactory, and after the machine has been finally leveled and aligned; otherwise, the leveling and alignment data of the machine should be rechecked prior to grouting. A、12 B、24 C、36. Answer to question 90 from yesterday: A. 90. When fitting thin-walled bearing shells to the bearing housings, in order to achieve a tight fit, an appropriate amount of interference is necessary; the cross-section of the bearing shell should be (A) compared to the cross-section of the bearing housing? A、Slightly higher ????? B、Slightly lower ????? C、At the same level. Answers are released the day before they are made public – those who get it right receive 10 wealth points before the release, 5 wealth points after the release, and 3 wealth points for just participating