[Discussion] [Weekly Question] Participate from 2/20/2017 to 2/26/2017 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 providing rewards in the form of financial benefits to users. 【Weekly Question】Multiple-choice question: Which of the following instruments used for the inspection of chemical products fall under the category of **work measuring instruments subject to mandatory calibration as specified by the Metrology Bureau? ( ) A. Measuring cylinder, balance B. Platform scale, hydrometer C. Beaker, weights D. Thermometer, measuring cup Standard answer: B. Post your answer in the reply section; you will receive +2 wealth points for participating in the quiz. An additional +3 to +8 wealth points will be given if you answer all questions correctly. Extra wealth points will also be awarded if you provide a thorough analysis and explanation of the questions or answers, or if you include 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.