Instruments: [Daily Question] April 14, 2011

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This post was last edited by cnooczhouyx on 2011-4-15 08:31. [Daily Question] Question for April 14, 2011: 1. Radar level gauges use high-frequency oscillators as microwave generators; the microwaves generated by these generators are guided to the radiation antenna using (　　). A. Waveguide B. Sonar tube C. Laser beam D. Conduction 2. When the microwaves emitted by the radar gauge reach the surface of the liquid, (　　). A. Partial absorption, partial attenuation B. Completely absorbed C. Completely reflected back D. Partial absorption, partial reflection back Note: 1) The top 50 participants will definitely receive a reward; no additional points will be given for those beyond 50. Among them, the first 20 who answer correctly will receive a ‘Wealth 5’ award, while those from 21 to 50 will get a participation prize. For the ‘Wealth’ category, 3 correct answers earn a reward and 2 incorrect answers do not ； Points can be awarded additionally for detailed analysis, in-depth discussion, and discretion ； 2) Please hide your replies; the method for doing this is at http://bbs.hcbbs.com/thread-492556-1-1.html. Do not edit the replies after posting them. (No rewards will be given for any replies that are not hidden. ) 3) Posts that expire will be closed, and the answers will become visible after the post is closed ； Thank you all for your participation ； 【Daily Question】Answer for April 14, 2011: 1. A 2. D.