
Symbolic representation of pipework components on technical drawings; functional representation; examples for the representation of open or shut-off flow
出版:German Institute for Standardisation (Deutsches Institut für Normung)

专家解读视频
Symbolic representation of pipework components on technical drawings; functional representation; examples for the representation of open or shut-off flow
出版:German Institute for Standardisation (Deutsches Institut für Normung)
专家解读视频