【Daily Question No. 063】2017.03.04

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This post was last edited by 955559 on 2017-7-31 at 16:44. [Daily Question No. 063] 2017.03.04 A check valve is a type of valve that relies on the pressure of the liquid and the ( ) of the valve disc to open and close the passage automatically, and it can prevent the liquid from flowing back. A. Self-weight B. Directionality C. Torque D. Reference answer is visible after self-compression recovery; scoring is possible by identifying the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) 2017 Q&A Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657794-1-1.html 2016 Q&A Summary Thread (updates completed) http://bbs.hcbbs.com/thread-1597792-1-1.html Third Round of Haichuan Outstanding Management Members Selection Contest http://bbs.hcbbs.com/thread-1655902-1-1.html (Source: Haichuan Chemical Industry Forum)