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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 a pump uses frequency conversion technology, what actually changes is the pump’s performance curve, while the ( ) curve remains unchanged. A. Temperature characteristics B. Pipeline characteristics C. Current characteristics D. Power characteristics Answer: B. Make a little progress every day. Your participation is the greatest support for our work. The fragrance remains on the hand that gives the rose. https://bbs.hcbbs.com/static/image/hrline/1.gif https://bbs.hcbbs.com/static/image/hrline/2.gif Note: The answers will be automatically revealed after two days. “My Device, My Home – Large-Scale Original Photo Sharing Event (Phase 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
After using variable frequency technology, the pump’s characteristic curve is essentially changed, while the ( ) curve remains unchanged. D. Power characteristics