【Weekly Question】Participate from 4/10 to 4/16, 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: When measuring the saturated vapor pressure, what should be done when taking samples? (A) Take from the top, (B) take from the middle, (C) three-stage sampling, (D) place it near the bottom of the tank and then pull it out immediately. Correct answer: D. Reply with your answer in the comments; you will receive +2 wealth points for participating in the quiz. An additional +3 to +8 wealth points will be given if all answers are correct. Extra wealth rewards will also be awarded if the questions or answers are analyzed and explained in detail (or if there are detailed calculation processes). If your answer is correct and your analysis and explanation are accurate, it will be marked as the best reply (or the best assistance). Feel free to answer the questions.