GOST 24204-1980 Decibel unit for measurement of levels loss and dain in wiring communications engineering《有线通信工程中衰减与增益电平测量用十进单位》.pdf

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SY 4032.1-1993 石油建设工程质量检验评定标准 通信工程（长途通信明线线路工程）.pdf

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YD 5031-1997 点对多点微波通信工程设计规范.pdf

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