Cov iav fiber ntau yog ib yam ntawm cov khoom siv inorganic nonmetal nrog kev ua haujlwm zoo, uas muaj ntau yam kev siv.Cov iav fiber ntau downstream thov suav nrog cov khoom siv hauv tsev, kev thauj mus los (tsheb, thiab lwm yam), cov khoom siv hluav taws xob, hluav taws xob (PCB) thiab cua zog, suav txog 34%, 27%, 1 ...
Nyeem ntxiv