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随着通讯技术的发展,美国和欧洲一些发达国家出现了双向电视。所谓双向电视是一种交互式电视,用户在家中不仅可以接收一般电
With the development of communication technology, two-way television has appeared in some developed countries in the United States and Europe. The so-called two-way television is an interactive television, users at home not only receive general electricity