【Daily Question No. 069】2017.09.14

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【Daily Question No. 069】September 14, 2017: Carbon dioxide fire extinguishers contain liquid carbon dioxide, and the principle behind their fire-fighting action is mainly due to the （ ） effect. Fill in the blanks; the reference answers will be visible after responding, and points can be earned by identifying the key points. The answers to the daily activity questions have changed; today’s answers will be shown in subsequent questions. For management purposes, if you need to view content from a few days ago, please go through the summary post below. 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 Petrochemical Sector – “Creative Ideas for Energy Saving” Campaign (the second phase is in full swing) http://bbs.hcbbs.com/thread-1666758-1-1.html (Source: Haichuan Chemical Industry Forum Website)