JJG(铁道) 177-2003 Verification Regulation Of the Charging Performance of SPC《局用程控交换机计时计费装置检定规程》.pdf

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YD T 693-1993 程控交换机基础电源技术要求.pdf

YD T 1534-2006 数字程控交换机信息安全技术要求和测试方法.pdf

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