题目内容
ATM信元中，UNI信头和NNI信头的差别是(21)。当网络出现阻塞时，交换机要(22)，信元路上传输时，ATM信元要装配成传输帧，如果高层没有数据发送，则必须插入空信元或(23)，以便将ATM层信元速率适配成传输线路的速率。ATM网络是基于(24)方式的数据交换网络，若要实现IP Over ATM，则需要(25)技术。
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听力原文：M Hi, Sara. Is this desk available？ I need to find some work space.
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M That's where Terry sits？ Then I can't work there. I just saw him in the parking lot.
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