【Daily Question】Sulfur Technical Version 20170818

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To increase the popularity of this section, a daily quiz campaign has been launched. The purpose of this campaign 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 52 hours. http://bbs.hcbbs.com/static/image/hrline/4.gif Multiple-choice question: When sampling acidic gases, it is necessary to pay attention to the wind direction; one should stand at (　　). A. Upwind B. Downwind C. Sidewind D. Any wind direction is acceptable. Answer: A. Note: The answer will be announced automatically in two days. Registered Chemical Engineer – Experience Sharing: “Learning from Others” event http://bbs.hcbbs.com/thread-1808158-1-1.html. 2017: Coal Chemical Industry – “My Technical Upgrades” http://bbs.hcbbs.com/thread-1786290-1-1.html. [Daily Question] Sulfur Technology Section – 2017 Summary Post http://bbs.hcbbs.com/thread-1811578-1-1.html