Mechanical Equipment [Daily Question] 2012.01.01 Sunday

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This post was last edited by zhiyuan1100 on 2012-1-2 10:34. Please hide the reply. Editing after posting will be invalid! Those who have different opinions on the reference answers provided can post for discussion the next day. Only the first participant with the same IP who replies to participate will be considered valid. This question is a multiple-choice question. You will get 5 points for answering two questions correctly, 3 points for answering one question correctly, and 2 points for the rest. Please hide your responses and methods.: http://bbs.hcbbs.com/thread-492556-1-1.html Multiple choice questions: 1. The oil volume of the hydraulic coupling is usually the volume of the oil chamber ( ), otherwise it will not work properly. A, 1/2 B, 2/3 C, 100% D, 1/3 2. Nominal diameter of galvanized steel pipe DN * * * express( ). A. The inner diameter of the steel pipe B. The outer diameter of the steel pipe C. Neither the inner diameter nor the outer diameter D. The average value of the inner diameter and the outer diameter Answer: BC In order to express its gratitude to all sea friends, Sofa will give special rewards of 5 points of charm to participating sea friends. In addition, special rewards of 3 points of charm will be given to "20th floor and 12th floor", and special rewards of 1 charm will be given to floors ending in 1. Thanks for participating! ! In order to express our gratitude to all sea friends for participating, we have prepared prizes. Happy New Year to all Haiyou friends! !