MSS SP-6-2021Standard Finishes forContact Faces of Pipe Flangesand Connecting-End Flangesof Valves and Fittings管法兰...
MSS SP-6-2021Standard Finishes forContact Faces of Pipe Flangesand Connecting-End Flangesof Valves and Fittings管法兰...
MSS SP-6-2021 英文版 管法兰以及阀门和管件端法兰的接触面标准精度.pdf

