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GB/T 11318.12-1996
电视和声音信号的电缆分配系统设备与部件 第12部分:系统输出口通用规范
Equipments and components used in cabled distribution systems primarily intended for television and sound signals--Part 12:Generic specifications for systemoutlets
GB/T 7475-1987
Water quality--Determination of copper, zinc, lead and cadmium--Atomic absorption spectrometry
GB/T 7479-1987
Water quality--Determination of ammonium--Nessler’s reagent colorimetric method
GB/T 7478-1987
Water quality--Determination of ammonium--Distillation and titration method
GB/T 17143.1-1997
Information technology--Open systems interconnection--Systems management--Part 1:Object management function