Polyeter, lub npe tag nrho: Bureau ethylene terephthalate, thaum kub hnyiab, cov nplaim xim daj, muaj cov pa luam yeeb dub ntau, thiab cov ntxhiab tsw ntxhiab tsw loj. Tom qab hlawv, tag nrho cov ntawm lawv yog cov khoom tawv. Lawv yog cov siv ntau tshaj plaws, tus nqi pheej yig tshaj, lon ...
Nyeem ntxiv