【Weekly Question】Participate from May 15 to May 21, 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 gas used as the mobile phase in gas chromatography analysis is called ( ). A. Carrier gas B. Combustion gas C. Assist gas D. Nitrogen Answer: A. Please reply with your answer in the comments; participating in the quiz earns you +2 wealth points. If you answer all questions correctly, you’ll receive an additional +3 to +8 wealth points. Those who provide thorough analyses and explanations for the questions (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 the best assistance). Feel free to answer the questions.