单词：hierarchical network model
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[00:04.31]For Questions 6-10,you'll hear a lecture on Internet. [00:09.87]While you listen, [00:12.83]complete the sentences or answer the questions. [00:17.87]Use not more than 3 words for each answer. [00:22.52]You now have 25 seconds to read the s
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[00:05.69]Before listening to each one,you will have time to read [00:10.14]the questions related to it. [00:13.90]While listening,answer each question by choosing A,B,C or D. [00:20.24]After listening, [00:23.41]you will have time to check your answ
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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 American's 60-Second Science. I'm Karen Hopkin. This will just take a minute. Oh what a tangled web we weave. Or so it may seem, because many social networks eventually evolve into one of just two states. We either all get along, o
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With millions of blogs on the internet, don't blame yourself if you can't keep up with them all. Advertisers are having the same problem. They know that there are substantial audiences who get their news, their humor, their gossip from blogs, but, re
2005年NPR美国国家公共电台
国务院总理李克强9月1日主持召开国务院常务会议。会议指出，建立分级诊疗制度(hierarchical medical system)，是深化医改的重要举措，有利于促进优质医疗资源下沉，推进基本医疗卫生服务均等化
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