【Daily Question】December 27, 2016 – Participation +2 Wealth； +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】 When using a hydrogen flame ionization detector, three types of gases are required. At startup, first turn on ( ), then turn on ( ), and only turn on ( ) at the time of ignition. Criteria: Nitrogen, air, hydrogen. For your replies to these questions, you will earn +2 wealth points; if you answer all of them correctly, you’ll get 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 answers are correct and your analyses/explanations are accurate, your reply will be marked as the best response (or the best assistance). Feel free to answer the questions.