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Participation: Prize 1 Wealth； Correct answer: Reward of 3 wealth points ； Note: This post is valid for 48 hours. https://bbs.hcbbs.com/static/image/hrline/2.gif https://bbs.hcbbs.com/static/image/hrline/3.gif 【Daily Question】Multiple-choice question: When switching between variable-frequency pump units, start the standby pump first; open the outlet valve of the standby pump. At the same time, the operator should increase the current supplied to the standby pump, while reducing the current supplied to the main pump until it reaches 0. Then close the main pump outlet, and the operator uses ( ) to control the flow rate. A. Pump outlet flow control valve B. Pump motor current C. Pump motor voltage D. Pump outlet gate valve Answer: B. Make a little progress every day. Your participation is the greatest support for our work. Giving roses to others leaves a pleasant fragrance in one’s own hands. https://bbs.hcbbs.com/static/image/hrline/1.gif https://bbs.hcbbs.com/static/image/hrline/2.gif Note: The answers will be published automatically after two days. “My Device, My Home – Large-Scale Original Photo Sharing Event (Part 2): https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1868167&extra=page%3D1 【Q&A】Summary of Catalytic Coking and Reforming Oil Blending Data for 2017–2018~~Continuously being updated: https://bbs.hcbbs.com/thread-1826018-1-1.html 【Daily Question】Summary of Catalytic Coking and Reforming Oil Blending Data for 2017–2018~~Continuously being updated: https://bbs.hcbbs.com/thread-1811219-1-1.html