GY中华人民共和国广播电影电视行业标准GY/T239—2009广播电视光缆传输干线网运行维护规程OperationandmaintenanceregulationsforradioTVopticalfibertransmissionbackbonenetwork2008-07-27发布2009-07-27实施国家广播电影电视总局发布GY/T239—2009目次前言..................................................................................................................................................II1范围........
