问题
填空题
在因特网用户接入中,所谓的“一线通”是 ______。
答案
参考答案:窄带ISDN(N-ISDN)
解析: 窄带ISDN用在因特网接入中,即所谓的“一线通”,它把2B+D信道合并为一个144Kbps的数字信道,通过一个ISDN终端适配器TA,用户可以用144Kbps速率的完整数字信道访问因特网。
在因特网用户接入中,所谓的“一线通”是 ______。
参考答案:窄带ISDN(N-ISDN)
解析: 窄带ISDN用在因特网接入中,即所谓的“一线通”,它把2B+D信道合并为一个144Kbps的数字信道,通过一个ISDN终端适配器TA,用户可以用144Kbps速率的完整数字信道访问因特网。
完型填空。 Look here, please! Can you see the man in black? _1__ is Mr. Lee, my English teacher. He teaches (教) us __2 _ five days a week. He is a very good teacher. __3 _ is he? He's forty-five. He is __4 _ American. He has a car (小汽车). _5__ yellow. Tom and Tim are _6__ sons. _7__ are in No.1 Middle School (一中). They can _8__ Chinese, _9__ they can't speak it well. Today they _10__ at school, because it is Sunday. | |||
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