单词：path control protocol
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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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Primrose是一种淡黄色的可爱花朵，名叫樱草花。它的花呈管状，聚集在一起形成伞形花序，花冠呈漏斗形或托盘状。Primrose起源于中古拉丁文prima rosa，意思
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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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Joe DeCapua 02 April 2010 Kenya has announced it will re-double efforts to control diarrheal diseases, one of the biggest killers of children under age five. Among the causes are unsafe water, as well as poor sanitation and hygiene. Kenyan ministries
VOA标准英语2010年(四)月
After four years of negotiations, representatives of 135 nations have unanimously agreed on the text of a protocol to end the illicit trade in tobacco products. Nations are expected to adopt the protocol, the first under the WHO Framework Convention
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