【Weekly Question】Participate from May 8 to May 14, 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: The purpose of measuring the corrosion of copper sheets is to qualitatively determine whether the oil sample contains substances that can cause metal corrosion. A. Sulfur oxides B. Hydrogen sulfide and hydrogen chloride C. Inorganic acids or bases D. Active sulfides or elemental sulfur Answer: D Post your answer in the replies; participating in the quiz earns you +2 wealth points. Those who get all answers correct receive an additional +3 to +8 wealth points. Extra rewards will be given for those who provide thorough analyses and explanations of the questions or answers, or who 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.