【Pump Technology Edition: Daily Question】April 8, 2020 (Section benefit: 10 wealth points as a reward for answering correctly before the answers are revealed)

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158. The lubricating oil tank is a device for the supply, recovery, sedimentation, and storage of lubricating oil; it is equipped with a heater that is used to warm the lubricating oil before startup, ensuring that its temperature reaches a certain range at the time of machine start-up, in order to meet the requirements for the proper operation of the machine.   A、25℃－35℃ B、35℃－45℃ C、45℃－55℃ Answer to question 157 on April 8, 2020: A. The most common material used for manufacturing gears is (A) A、medium-carbon steel B、gray cast iron C、cast bronze. (Answers are released the day before they are officially announced; those who get it right before the announcement receive 10 wealth points, those who get it right after the announcement receive 5 wealth points, and those who participate receive 3 wealth points.) I’ve been a bit busy lately, so 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 questions and respond to everyone. Thank you all for your continued support