GB/T 13747.6-1992
Zirconium and zirconium alloys--Determination of copper content--2,9-Dimethyl-1,10-phenanthroline spectrophotometric method 锆及锆合金化学分析方法 2,9-二甲基-1,10-二氮杂菲分光光度法测定铜量 |
GB/T 13859-1992
Performance andtest methods of 30-channel pulse code modulation drop/insert equipment at 2048kbit/s 2048kbit/s 30路脉码调制分插设备技术要求与测试方法 |
GB/T 4958.15-1992
Methods of measurement for equipment usedin terrestrial radio-relay systems--Part 1:Measurements common to sub-systems and simulated radio-relay systems--Section four--Measurements in the baseband 地面无线电接力系统所用设备的测量方法 第一部分:分系统和仿真无线电接力系统通用的测量 第四节 基带范围的测量 |
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