【Daily Question】Catalytic Coking Reformate Blending Version 20171209

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Participation: Prize of 5 Wealth； Correct answer: Reward of 10 wealth points ； Note: This post is valid for 48 hours. Single-choice question: Before starting a motor-driven centrifugal pump, the outlet valve should be closed. The purpose of this is ( ). A. Prevent liquid from flowing back. B. Prevent the fluid from exerting impact on the control valve after startup. C. Prevent the motor from being damaged due to excessive current when the pump starts. D. Protect the pump body. Answer: C. Please take part by clicking; our ultimate goal is for everyone to acquire knowledge. 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 released automatically 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 Post for 2017 on the Catalytic Coking and Reforming Oil Blending Version: https://bbs.hcbbs.com/thread-1826018-1-1.html 【Daily Question】Summary Post for 2017 on the Catalytic Coking and Reforming Oil Blending Version: https://bbs.hcbbs.com/thread-1811219-1-1.html