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Jul 06, 2019Qhov txiaj ntsig thiab kev phom sij ntawm cov yasPlastics yog cov khoom sib txuas macromolecule, uas tseem tuaj yeem raug hu ua macromolecule lossis macromolecule. Lawv tseem muaj npe hu ua plastics lossis resins. Lawv tuaj yeem -
Jun 28, 2019Kev faib tawm ntawm Cov Khoom Uas Muag Yas Rov QabKev faib tawm ntawm Cov Khoom Uas Muag Yas Rov Qab
