Mechanical Equipment: 【Question of the Day】2011.03.31

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This post was last edited by Black gold on 2011-4-1 06:36. Please hide your replies; editing after posting is ineffective! Those with different views on the provided answer keys can post discussions the next day. For multiple accounts under the same IP responding to participate, only the first response is valid. This issue consists of multiple-choice questions; 5 points are awarded for each correct answer, and everyone who participates will receive a reward. In principle, scores are given to the top 50 respondents who answer within 48 hours. Please hide your replies; the method for doing this is: http://bbs.hcbbs.com/thread-492556-1-1.html. For most vane pumps, in order to increase the total head and improve the suction conditions of the pump, the absolute velocity angle α1 of the inlet velocity triangle is usually set to (　　　) A α190° ； D α190° is also possible. Answer: Choose (B)