UDC621.396.6.:629.12.018M50中华人民共和国国家标准GB/T12650-90奥米加和差奥米加系统船用接收设备性能要求和试验方法Performance requirements and methods of testingfor OMEGA system and differential OMEGA systemreceiving equipments for ships1990-12-28发布1991-10-01实施国家技术监督局发布
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