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8International Standard Organization. ISO 5167-1 measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full-part 1: General principles and requirements[S]. 2nd edition. Switzerland: the International Organization for Standardization, 2003.
9International Standard Organization. ISO 5167-2 measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full-part2: Orifice plates[S]. 2nd edition. Switzerland : the International Organization for Standardization, 2003.
10International Standard Organization. ISO 5167-3 measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full-part3: Nozzles and Venturi nozzles[S]. 2nd edition. Switzerland: the International Organization for Standardization, 2003.