【Daily Question】August 6, 2016: +2 wealth for participation； +3 to +10 wealth for correct answers

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To increase the popularity of the chemical analysis section, a \"One Question per Day\" campaign has been launched to foster an active atmosphere for technical exchanges while offering members certain financial rewards. 【Daily Question】 (Single-choice question) Which of the following is an incorrect usage of a weighing flask? ( ) A. It cannot be used as a reactor. B. The lid must be closed tightly when not in use. C. The lid must be used in conjunction with the flask. D. It should be washed clean after use. Correct answer: B. Reply with your answer in the comments; participating in the quiz earns you +2 wealth points. Those who get all answers correct will receive an additional +3 to +8 wealth points. Extra rewards will be given for thorough analyses and explanations of the questions or answers, or for detailed calculation processes. If your answer is correct and your analysis is accurate, it will be marked as the best reply (or the best assistance). Feel free to answer the questions.