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【Daily Question No. 251】2017.09.09

2017-09-09View Original

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【Daily Question No. 251】September 09, 2017: Piston rings have the characteristic of self-sealing. ( ) Judgment: The reference answers will be visible after responding; points can be earned by identifying the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) The answers to the daily activity questions have changed; today’s answers are shown in the subsequent questions. For management purposes, if you need to view content from a few days ago, please access it through the summary post below. 2017 Q&A Summary Thread (updates have started) http://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updates have started) 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 (Source: Haichuan Chemical Industry Forum)

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