GB/T 35138-2017封闭管道中流体流量的测量渡越时间法液体超声流量计国家标准
英文:Measurement of fluid flow in closed conduits—Ultrasonic transit-time meters for liquid GB/T 35138-2017介绍: 国家标准《封闭管道中流...
英文:Measurement of fluid flow in closed conduits—Ultrasonic transit-time meters for liquid GB/T 35138-2017介绍: 国家标准《封闭管道中流...