2. 外语
  3. In 1948, people living in remote areas could see TV programs by ______ in the United States. In tuning system, the Federal Comm

In 1948, people living in remote areas could see TV programs by ______ in the United States. In tuning system, the Federal Comm

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问题 In 1948, people living in remote areas could see TV programs by ______ in the United States.
In tuning system, the Federal Communications Commission had distributed parts of ______ spectrum to 12 television channels which were broken into two groups to avoid interference with existing services at the beginning.
选项
答案the very high frequency
解析 该段提到，在两个调谐系统中，FCC一开始是将高频(the very high frequency，频谱分配给12个频道，为了避免跟已经存在的服务互相干扰，这些频道被分成两组。
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