Lub tshuab ntim khoom yog hais txog cov tshuab uas tuaj yeem ua tiav tag nrho lossis ib feem ntawm cov khoom thiab cov khoom ntim cov txheej txheem, feem ntau ua kom tiav filling, qhwv, sealing thiab lwm yam txheej txheem, nrog rau cov txheej txheem ua ntej thiab tom qab, xws li tu, stacking, thiab disassembly. ..
Nyeem ntxiv