【Purification Daily Question】June 14, 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 providing members with certain financial rewards. (Friends at sea, if you have any good questions, feel free to send them to me; let’s work together.) 【Daily Question】 The sealing method that increases the resistance in the leakage path is (　　). A. Labyrinth seal B. Sealant seal C. Oil seal seal D. Vacuum seal. Reply with your answer; participating in the quiz earns +2 wealth points. Those who get all answers correct will receive an additional +3 to +8 wealth points. Extra rewards will be given for thorough analyses and explanations of the questions or answers, or for 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. A