题目内容：
宽带ISDN的核心技术是__________。
参考答案：
答案解析：
单选题：宽带ISDN的核心技术是__________。
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The principle for a stack memory to store data is .
The principle for a stack memory to store data is .
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As an important phase in software development，software design is the continuatio
The prototyping method is a dynamic design processs，which re
The prototyping method is a dynamic design processs，which requires people who us
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