GB/T 34041.2-2017封闭管道中流体流量的测量气体超声流量计第2部分:工业测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 2: Meters for industrial applications GB/...
英文:Measurement of fluid flow in closed conduits—Ultrasonic meters for gas—Part 2: Meters for industrial applications GB/...