美利体育登录入口官网:LST EN ISO 5167-3:2020 通过插入满载圆形横截面管道中的压差装置测量流体流量 第3部分:喷嘴和文丘里喷嘴(ISO 5167-3:2019)
Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full - Part 3: Nozzles and Venturi nozzles (ISO 5167-3:2019)