题目内容：
adsl信号在双绞线上传输，线路衰减参数在0.4mm线经的双绞线上3km的传输距离不应大于（）.
参考答案：
填空题：adsl信号在双绞线上传输，线路衰减参数在0.4mm线经的双绞线上3km的传输距离不应大于（）.
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- 题目类型：填空题
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