新编大学英语听力3 unit8

[00:03.13]Healthy Living [00:06.52]Part Two [00:09.86]Listening-Centered Activities [00:14.33]Listening 1 [00:17.93]Exercise 1 [00:21.24]Directions: [00:24.84]Listen to the talk and choose the best answer to each question you hear on the tape. [00:31

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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

SSS 2008-04-14

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