Manufacturing Ppr Pipes,fittings and valves, different kinds of Brass accessories, such brass inserts for ppr fittings, brass male unions, female unions, double union ball valves, valve cartridges ...

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Work with colleagues and see diagram changes in real time, as if working together in person. See where coauthors are working in the file and what they’re working on—down to the specific shape. Create ...

School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi’an, Shaanxi 710129, China ...