【Daily Question】Nov. 2, 2015: Participate for +2 wealth； +3 to 8 wealth for correct answers

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This post was last edited by zjp on 2015-11-3 at 11:15. To increase the popularity of the chemical analysis section, a \"One Question per Day\" campaign has been launched; this aims to foster active technical exchanges while also providing financial rewards to users. 【Daily Question】 (Single-choice question) Besides the carrier gas system, column separation system, and injection system, another major system in a gas chromatograph is ( ). A. Constant temperature system B. Detection system C. Recording system D. Sample preparation system Please reply with your answer in the comments; answering the question earns +2 wealth points. Getting all answers correct adds an additional +3 to +8 wealth points. Those who provide thorough analysis and explanations for the questions or answers (or include detailed calculation processes) will receive extra wealth points as a reward. 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. Note: We will close this post after 24 hours, and at that time we will announce the best reply (the best assistance), as well as the answer and explanation.