GB/T 34041.1-2017封闭管道中流体流量的测量气体超声流量计第1部分:贸易交接和分输计量用气体超声流量计国家标准
英文:Measurement of fluid flow in closed conduits—Ultrasonic meters for gas—Part 1: Meters for custody transfer and alloca...
英文:Measurement of fluid flow in closed conduits—Ultrasonic meters for gas—Part 1: Meters for custody transfer and alloca...