以下为句子列表：
英文: Abstract: The sources and categories of noise about return-path of HFC(hybrid fiber/coax) are analyzed, and a few effective methods of reducing noise are presented for different noise,which simultaneously the choice of modulation and multiple access techn
中文: 文摘:分析了HFC网络上行信道噪声的来源和分类，针对不同的噪声提出几种有效的抑制方法，同时结合上行信道多址接入方式和调制解调方式的选择来抑制噪声。
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英文: An adaptive congestion control algorithm in code division multiple access (CDMA) systems from the aspect of reducing cost is proposed.
中文: 摘要从降低开销的角度出发，提出了一种自适应的码分多址(CDMA)系统拥塞控制算法。
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英文: Which characteristics describe carrier sense multiple access collision detect (CSMA/CD)? (Choose three.
中文: 那种特性描述载波监听多址存取冲突检测?
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