Kev tsim khoom plig tshwj xeeb
Zoo nkauj heev: yooj yim tab sis tsis yooj yim tsim, kev pom tsis zoo, khoom kim heev thiab kev ua haujlwm zoo, txaus los qhia nws qhov zoo
Cov thev naus laus zis zoo heev: nws yog polished los ntawm kev xaiv cov khoom siv nruj, pov thawj, polishing, electroplating thiab lwm yam txheej txheem, nrog gloss zoo dua
Cov ntsiab lus tsim kom muaj kev ntxim nyiam: txhua qhov ntsiab lus yog qhov ua tib zoo thiab ua tib zoo, thiab txhua yam khoom siv yuav tsum ua tau raws li qhov zoo thiab cov qauv siab
Cov Khoom Plig Qhia: Peb xim xaiv tau
Tooj Liab Qub
Cov Khoom Siv Qub Qub
Cov Neeg Ua Haujlwm Cooper Qub