三大的另外两个是abc和cbs nbc 1926年创建于纽约，是美国无线电公司的子公司，创始人大卫·沙诺夫有 “美国无线电广播之父” 之称。 nbc从1928年开始涉足电视业，现已成为多元化的电. 锁定的问题。 此问题已从 microsoft 支持社区迁移。 你可投票决定它是否有用，但不能添加评论或回复，也不能关注问题.
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