TCVN 6737-2000 Household refrigerators Methods of test for the information of the consumer《家用冰箱 对用户信息的试验方法》.pdf

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YD T 921-1997 数据网上提供国际帧中继PVC业务的用户信息传送性能参数.pdf

GB T 26875.1-2011 城市消防远程监控系统 第1部分：用户信息传输装置.pdf

GB 26875.1-2011 城市消防远程监控系统 第1部分：用户信息传输装置.pdf

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