qhia txog qhov xwm txheej tam sim no thiab kev txhim kho yav tom ntej ntawm kev lag luam thoob ntiaj teb thiab Tuam Tshoj petg membrane
petg, tag nrho cov lus Askiv lub npe poly (ethylene terephthalateco-1,4-cylclohexylenedimethylene terephthalate) yog pob tshab thiab amorphous copolyester.
Saib ntxiv