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由广播科学研究所技术开发部举办的“卫星电视收转技术”和“电视发射机及差转机”二个技术培训班于4月30日在京同时
Two technical training courses entitled “Satellite TV Receiving Technology” and “TV Transmitter and Difference Transfer Machine” organized by the Technical Development Department of the Broadcast Science Institute were held in Beijing on April 30