【Weekly Question】Participate from 7.10~7.16, 2017 for +2 wealth； +3 to +10 wealth for correct answers

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To increase the popularity of the chemical analysis section, a \"Question of the Week\" campaign has been launched to foster an active atmosphere for technical exchanges while offering rewards in the form of financial benefits to users. 【Weekly Question】Multiple-choice question: GB/T1884 \"Method for Determining the Density of Petroleum and Liquid Petroleum Products\" requires that crude oil samples be heated to ( ) A 3℃ above the pour point B 3℃ above the cloud point C 20℃ D room temperature. Answer: C. Reply with your answer in the comments; participating in this quiz earns you +2 wealth points. Those who get all answers correct receive an additional +3 to +8 wealth points. Those who provide a thorough analysis or explanation of the question and answers, or include detailed calculation processes, will receive extra wealth points as a reward. If your answer is correct and your analysis is accurate, it will be marked as the best reply (or best assistance). Feel free to answer the questions.