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To increase the popularity of this section, a daily quiz activity has been launched. The purpose of this activity is: “Learn a little bit every day, and make significant progress over ten days.” I hope everyone will participate actively; by learning and making progress, they can also easily bring wealth home :) . Participation: Prize of 5 Wealth ； Correct answer: Reward of 10 wealth points ； Note: For questions from the same day, full feedback will be given if answered on the same day; answering the next day earns 5-8 wealth points. This post is valid for 48 hours. Multiple-choice question: When steam is introduced, the high-temperature steam comes into contact with the condensate water in the pipes; as a result, the temperature of the condensate water rises, causing ( ) to occur. The volume of this liquid expands rapidly, leading to what is known as a \"steam hammer,\" which causes the pipes to vibrate violently – this phenomenon is called \"water hammer.\" A. Chemical reaction B. Phase change C. Explosion D. Condensation Answer: B Petrochemical sector – Innovative ideas for energy savings: “Creative Thinking” campaign (the second phase is currently in progress) http://bbs.hcbbs.com/thread-1666758-1-1.html 2017: Coal chemical industry – “My technical improvements” http://bbs.hcbbs.com/thread-1786290-1-1.html [Daily question] Sulfur technology section – Summary post for 2017 http://bbs.hcbbs.com/thread-1811578-1-1.html