单词：Protocol Control Information
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Half Duplex Half duplex is a transmission path capable of transmitting signals in both directions, but only in one direction at a time. HDLC high-level data link control Header The header is control i
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This is Scientific Americans 60-Second Science, I'm Cynthia Graber. This will just take a minute. In vitro fertilization(试管受精) efforts can be helped by oddly enough oral contraceptives .That's the finding from Tel Aviv University, site of the
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This is Day to Day from NPR news, I am Medlin Bran. Have you ever wondered just who runs the Internet? Well a non-profit organization here in the US is responsible for technical oversight, but lately there's been some loud protests from other countri
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HEALTH REPORT - Centers for Disease Control By Jerilyn Watson Broadcast: Wednesday, February 25, 2004 This is the VOA Special English Health Report. Building 21 of the CDC in Atlanta, Georgia. One of
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7) 科技 科学发展观 concept of scientific development 全民科学文化素质 scientific and cultural qualities of the entire people 发展科技 scientific and technological advancement 科教兴国 revitalize China through science and educat
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BEIJING, Dec. 25 (Xinhuanet) -- China is likely to test a new Internet protocol in the next few years in an attempt to further develop the country's Internet, senior officials from the State Council said on Friday. The country will put the Internet P
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