GB/T 15972.49-2021光纤试验方法规范第49部分:传输特性的测量方法和试验程序微分模时延标准
英文:Specifications for optical fibre test methods—Part 49: Measurement methods and test procedures for transmission chara...
英文:Specifications for optical fibre test methods—Part 49: Measurement methods and test procedures for transmission chara...