【Purification Daily Question】May 7, 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 users with certain financial rewards. (Fellow sailors, if you have any good questions, feel free to send them to me; let’s work together on them.) 【Daily Question】 (Fill in the blanks) The main components of a centrifugal pump are ( ), ( ) and ( ). Post your answer as a reply; participating in the quiz earns you +2 wealth points. Getting all answers correct adds another +3 to +8 wealth points. If you provide a thorough analysis and explanation of the questions or answers, or include detailed calculation processes, you will receive additional wealth rewards. 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. Impeller, pump casing, shaft seal device