【Daily Question No. 173】2017.06.22

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【Daily Question No. 173】June 22, 2017: Among the methods for preventing pump cavitation, which one is incorrect? ( ) A. Reduce the flow resistance at the pump inlet. B. The suction height of the pump should be selected according to the specified values. C. When selecting materials resistant to cavitation for manufacturing the components, the surfaces must have sufficient smoothness. D. The inlet valve of the pump cannot be opened fully; refer to the reference answers – scoring is based on identifying the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) D-scoring criteria: 2 Wealth points for incorrect attempts; 3–8 points for *incomplete* answers. 10 Wealth points for correct answers, provided with detailed explanations; 15–20 Wealth points for correct answers with additional *insufficient* details. Please score according to these criteria. Note: If there are editing records after answering, only those who participated will be credited points. For continuous malicious spamming, 2 points will be deducted each time, with no upper limit. Pure numbers, pure emojis, or random letters unrelated to the answer are all considered malicious spamming; points will start to be deducted after three warnings. 2017 Q&A Summary Thread (updating now) http://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updating now) http://bbs.hcbbs.com/thread-1657794-1-1.html 2016 Q&A Summary Thread (already updated) http://bbs.hcbbs.com/thread-1597792-1-1.html