Mechanical Equipment [One Question per Day] 2011.11.11
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This post was last edited by Black gold on 2011-11-18 at 19:51. Please hide your replies; editing after posting is invalid! Those with different views on the provided answer keys can post discussions the next day. For responses from multiple accounts under the same IP, only the first one submitted counts as valid. This is a single-choice question; 5 points are awarded for a correct answer. Everyone who participates will receive a reward. Please hide your reply using the following method: http://bbs.hcbbs.com/thread-492556-1-1.html Single-choice question: What type of impeller is most commonly used in high-speed centrifugal pumps? A. Open type B. Semi-open type C. Closed type D. All of the above Answer: A
Reply to 1# A Pot of Aromatic Tea B
C. Closed-loop reply 1# A pot of fragrant tea
Reply to 1# A Pot of Aromatic Tea a
Reply to 1# A Pot of Aromatic Tea