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Cov duab uas nthuav dav yog tsim los ntawm ob txheej txheem
Cov graphite graphite yog tsim los ntawm ob qho txheej txheem: tshuaj thiab hluav taws xob. Ob txoj txheej txheem sib txawv ntxiv rau cov txheej txheem oxidation, deagidification, ntxuav dej, lub cev qhuav dej, kom qhuav thiab lwm yam txheej txheem yog tib yam. Qhov zoo tshaj ntawm cov khoom ntawm feem ntau feem ntau ntawm kev tsim ...Nyeem ntxiv