Lub Kaum Ib Hlis 4, 2020, Mr. PETER FRANZ, Chief Engineer of Technology thiab R&D of Grace, tau muab kev sib koom siv thev naus laus zis zoo ntawm "Frontier Energy-saving Technologies and Development Trends of Plastic Pipe Manufacturing" ntawm lub rooj sib tham hauv Hall 5 ntawm Nanjing International Expo Cov...
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