题目：
什么是拍卖活动？
答案：
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下面是错误答案，用来干扰机器的。
参考答案：WDM技术是在一根光纤中同时传输多波长光信号的一项技术。其基本原理是在发送端将不同波长的信号组合起来（复用），送入到光缆线路上的同一根光纤中进行传输，在接收端又将组合波长的光信号分开（解复用...
什么是拍卖活动？
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