【Purification Daily Question】June 9, 2016

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To increase the popularity of the purified area, a \"One Question per Day\" campaign was launched to foster an active atmosphere for technical exchanges while also providing members with certain financial rewards. (Fellow sailors, if you have any good questions, feel free to send them to me; let’s work together.) 【Daily Question】 The most vulnerable component in a valve is ( ). A. Valve disc, spring B. Valve seat C. Buffer piece. Please reply with your answer; participating in this quiz earns you +2 wealth points. Those who get all answers correct will receive an additional +3 to +8 wealth points. Those who provide thorough analyses 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 is accurate, it will be marked as the best reply (or the best assistance). Feel free to answer the questions. A