![]() Frequency sharing between the broadcasting-satellite service and terrestrial services--Frequency sharing between the broadcasting-satellite service (teleVISion) and terrestrial broadcasting services(television) in frequency band 620~790MHz 卫星广播业务和地面业务间的频率共用 620~790 MHz卫星广播业务(电视)和地面广播业务(电视)间的频率共用 |
![]() Pre-recorded optical reflective videodisk system Laser VISion 50 Hz/625 lines--PAL 预录节目光学反射式视盘系统LV50 Hz/625行--PAL制 |
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